Soldiers in combat can kill without moral injury
75 comments
·April 18, 2025tbrownaw
pyeri
Another common exception is when the collective herd instinct is invoked. When 10-15 folks congregate at a place and unleash their subliminal thought patterns, it becomes much easier to sanction a kill as it's now part of a collective guilt conscious and no one person has to bear any injury, not even a moral one.
zadler
prepare for war, western man!
bjornsing
The conclusion sounds reasonable and may well be correct. But I’d still be a bit worried about selection effects. The kind of person who signs up for a tour of duty to Afghanistan is probably a bit different than someone who signs up for a UN peacekeeping mission.
So an alternative conclusion / title could be: “Moral injury more common among those with high moral standards”.
Extropy_
A better title would be "Likelihood of moral injury differs among different combat contexts," though that doesn't serve as quite a catchy title as the original.
The problem with "moral injury more common among those with high moral standards" is that "moral standards" is not what is being observed, rather, the study specifically finds "diverging effects of KIC on veterans from combat-oriented and peacekeeping missions-" making no judgement about personal "moral standards."
Your "high moral standards" bit seems to be an assumption about the difference between peacekeeping forces and combat-oriented forces (which sometimes even overlap) rather than something to do with the actual research article at hand.
kstenerud
This was most definitely not the case with my wife. Before Ukraine, she would never have even considered killing another human being. In the war it was very different. Every dead Russian was one step closer to a safe Ukraine.
monetus
Talk about your wife some more?
The emotional churn when watching russians throw their lives away in belligerent assaults in flattened cities, mined fields and the like, is difficult to convey; righteous fury I've never felt in another context.
hliyan
I have to agree. Evolution seems to have placed human empathy on a spectrum -- some have a lot of it and perform caregiver functions within a community, others have less of it and tend to perform defensive function. While we may not have physically differentiated castes as do ants, it would be unwise to assume that all healthy humans will have the same level of empathy. Layer on top of that, military training designed to further attenuate empathy, and you get a very select group. That said, since that group is basically "soldiers", the claim "Soldiers can kill without moral injury", isn't inaccurate.
mmooss
> Evolution seems to have placed human empathy on a spectrum
What makes you say the spectrum is caused evolution? I would say, based on what I've seen, it's caused by lifetime experience and parenting/mentoring.
> some have a lot of it and perform caregiver functions within a community, others have less of it and tend to perform defensive function.
Experts consider empathy an essential tool of conflict: it's required to understand the emotions of the enemy, which is necessary to anticipate and understand. Remember that humans evolved without literacy and possibly they wouldn't have understood their enemy's spoken language.
> military training designed to further attenuate empathy
I would guess that it's the opposite, for the reasons above. Also, afaik empathy for others is the same mechanism as empathy for oneself and that is essential for processing emotions, which is essential for handling traumatizing experiences. People with less empathy are much less functional under stress.
They talk tough, though.
wqaatwt
There is a whole Wikipedia article about UN peacekeepers committing atrocities. Not sure if claiming that on average they have “higher moral” standards than people who sign up for the Norwegian Army is fair (and they at least occasionally face repercussions for their actions unlike the “peacekeepers”)..
https://en.m.wikipedia.org/wiki/Sexual_abuse_by_UN_peacekeep...
bjornsing
I don’t think people who signed up for the Norwegian army were randomly sent to Afghanistan. It was most likely a voluntary assignment. Thus the strong selection effect.
Gud
Not in my experience.
Did a tour in Afghanistan and Kosovo. Both completely just invasions, IMHO.
jmward01
Time plays a factor that may not be well controlled for here. As you get older the actions you have taken and the events you have participated in can impact you in new ways.
nirui
I don't think it's the time. Morality only exists in people who has it. Some already do, some are growing, some never will.
Funny thing is, the individuals who never had morality maybe more mentally healthy than the others, since the consequences of their action never entered their brain. Gankers are happier than the ganked, I guess.
Maybe that's why the armies around the world loves to hire dumb people into their ranks, never think, never thought, and thus ruthless and don't cost much.
SoftTalker
Yep, fairly common to hear about old veterans who will not discuss what they did in combat, one could guess because they don't want to resurface those memories.
monetus
My grandfather was in the Pacific theater during WW2, but only the military knows why he had nightmares.
kstenerud
They won't talk to you about it because you can't understand, and talking to you about it would just make them feel more isolated and alone. Only others like them could understand.
jmward01
I think there are a lot of different reasons. The thought that other person may not understand could be one, but also that you just don't understand well enough what to say and the mixed emotion of being proud of doing something at a high level with the changing understanding of what actually resulted from those actions.
ty6853
The risk perhaps not so much moral injury, but that combat and war is almost like a drug. Imagine going back home to a toddler raging about the wrong color cup, a narrow set of civil rules, and flipping burgers after living a life out the back of a pickup truck with nothing but a rifle and your buddies keeping you alive.
Fucking boring.
But I'm no killer, just a guy who spent a few months in a civil war, and met a lot of people who met the Hemingway quote:
"Those who have hunted armed men long enough and liked it never care for anything else thereafter."
vasco
Whenever you have these feelings, go watch actual real life combat footage. A great recent one is a knife fight to the death where one soldier admits defeat and asks the first one to leave him to die https://www.reddit.com/r/CombatFootage/s/tAUwd2MWqT
Watch that and tell me if you think it's still cool and normal life is boring. I find that it snaps me right back out of "Hollywood war" thinking and makes my stomach turn.
ty6853
A lot of the guys I met in the YPG had seen way more combat than that and still yearned for it. One of them was retired foreign legion that did this as his retirement. When we were getting shot at one of the older guys would get viscerally excited and joyful, and he had seen many dead.
Junky is a good description of what they were. They wanted another taste. I can't imagine after 5+ years of that life how you would detox from that, not easily I imagine.
runjake
It’s not about it being cool. It’s about it feeling “normal”.
I’m not even sure this is caused by trauma so much as just living a whole other life in a whole other culture with completely different norms, even with combat aside.
Going back into the civilian world is a pretty uneasy experience for a lot of veterans.
It’s kind of a hard feeling to relay to civilians. A very strong culture shock for even many POGs.
I think your advice is better suited to people who glorify war and play too much Call of Duty.
pdpi
> Watch that and tell me if you think it's still cool and normal life is boring.
I didn't get the feeling that OP was saying it's cool. Rather, that it's intense, and that the intensity itself is addicting.
I was on jury duty for a murder case last year, and it was like living in a different reality. The weight of the responsibility bore down on me hard, it felt like the stakes of what I was doing were higher than anything else in my life. It took me a while afterwards to fully come back down to earth. OP is basically saying that war feels somewhat like that - you come back home and the stakes feel trivial.
alexey-salmin
That can be applied to people who never went to real war and base their views on Hollywood films.
However the "combat addiction" among people who did go to war is still very real. There are countless stories of people who knowingly chose to go back.
I think it's important to recognize that the idea "if only people knew how awful the war is, no one would go there" doesn't really work.
foolfoolz
there are vets who return from a deployment and can’t adjust to life at home. and they re-deploy many times over. i’m not going to call one cool and one boring, you’ll have to ask those guys what their motivation is
closewith
A lot of men have seen that video and rather than the repulsion that you feel, they wonder _would I have survived?_.
defrost
William George Murray came home from WWI, during that time
In a letter to his parents, Murray described his participation in the battles at Gallipoli during August 1915.
Murray wrote about how the advancing Turks were mowed down with machine gun and artillery fire and how it was "great fun and very exciting."
He took up work in the Northern Territory of Australia in stock policing role: In April 1919, Murray joined the Northern Territory Police as a constable and was posted to the very remote Ranken River police station on the Barkly Tableland.
Now, mixed race station workers, some white, some aboriginal, camped togther and in a dispute over a woman, an aboriginal man killed a white man over a rape. The rape violated both white and native law, as did the killing in revenge.There was a single known perpetrator and ways and means to bring them to justice under either of two bodies of law with the cooperation of both groups of people.
Murray got involved ..
Officially, 31 men, women and children were killed during this police operation, although analysis of the existing documentation and surviving Aboriginal testimonies indicate that somewhere between 100 and 200 people were shot dead.
Coniston massacre (1928): https://en.wikipedia.org/wiki/Coniston_massacreSuch was the excess of a shell shocked man with a badge allowed free reign over civilians.
otikik
I don't know, man. I am the kind of person who can't help but think "this 1.5-tons metal cage just moved 20 meters while I was blinking" while driving my car on a highway. Needless to say, I don't enjoy driving.
On that truck I would be thinking "we are exposed, an enemy can shoot at us from that cliff" 90% of the time.
To me "fun" is "not having to think those things".
quantified
I would be surprised if there were any universal sense of moral injury. If the child grows up with warrior morals, they will not worry about opponent's death.
mmooss
> If the child grows up with warrior morals, they will not worry about opponent's death.
What are 'warrior morals' and what is the basis of your claim? It sounds like science fiction or fantasy.
joseppu
Desperate 18 y.os needing that cosy salary is enough of an incentive. No need for romanticization like warrior morals or something. War is industrialized enough.
somenameforme
There's a major bias in this study. Many of the people most negatively affected by combat have exactly 0 interest in discussing it, even with those close to them or other veterans. This study observed this bias but seems to have made no effort to go beyond acknowledging it:
---
Combat Study: ... non-responders had more long-term sick leave and social benefits than the survey responders (p < .001). Accordingly, there was a response bias in terms of study participants being in better health and having less need of government assistance than the non-responders. Moreover, there were significant differences in biological sex and age between responders and non-responders (p < .001) such that women and older veterans had higher response rates.
---
Noncombat Study: The responders were significantly older and had significantly lower frequencies of short- and long-term sick leaves, long-term welfare benefits, and sick leave due to mental illness (p < .001). Thus, similar to the trend in the combat-oriented sample, these results show a response bias in terms of responders being in better health and having less need of government assistance than the non-responders.
---
It dismissed the need to consider these biases with: "Although the non-responder analysis revealed some response bias, the overall response rate was high in both studies, and the effect size estimates associated with the observed response bias were small." But that seems questionable. The response rate was less than 60% in both studies, and giving an effect size estimate on an unmeasured and "significantly" demographically different population seems to be a textbook example of begging the question.
singularity2001
One of the greatest achievements of free speech laws is that in Germany one can write the truth "soldiers are murderers" on T-shirts
thayne
Wouldn't another possible explanation of these results be that trying to kill someone, or participating in actions with the goal of killing other people causes the same "moral wound" as actually killing someone?
mmooss
Or seeing people killed.
klntsky
> if combat soldiers are, as a rule, psychologically unharmed by killing an enemy, does this increase the risk that they may be willing to kill captives or civilians who they have come to class as 'the enemy'?
It's obviously the opposite: the more traumatized one is, the more likely he is to commit a war crime.
genericperson66
Who the f funds this research?
WorkerBee28474
Usually governments, because they want to understand the mental health of their soldiers.
newsuser
> "Original data collection for both studies was funded by the Norwegian Department of Defense; however, data extractions were archival and, hence, not funded."
null
rurban
That's why the usual strategy is to dehumanized your enemy by calling them some animal names. The Nazis called them rats, the Hutis in Ruanda called them cockroaches, the Russians and Ukrainians both use the same tactics
maoberlehner
> commonly-held idea that killing is an 'unnatural' act for humans
People killing people is one of the better-documented aspects of human history. If it's really a commonly-held idea, it's a delusional one. I think what they mean is 'unethical' rather than 'unnatural'.
Barrin92
For individuals killing is incredibly rare. Most people will never take a life, and even historically haven't. It also of course doesn't follow that merely because killing happens it doesn't cause moral injury, it's obviously possible for an event to be both common and traumatic.
It is generally accepted that most people will resist to kill and moral injury is very well documented for example in police who have to use deadly force so the result here is actually surprising. Afghanistan might also be an unusual case by historical standards, because close combat was very rare and the fighting much more impersonal.
maoberlehner
I agree with your points, and how I interpret "natural" has nothing to do with how often an individual does something. Many humans drive their cars every day. Does this make it a natural thing to do? I can see a definition of the word that makes it so. Still, the way I see it is that driving a car is something very unnatural to do, even if many people do it every day, but killing humans is something very natural, although most humans will never do it.
Most people will absolutely kill another human if the circumstances call for it. It's in our nature to do so.
mmooss
> Most people will absolutely kill another human if the circumstances call for it. It's in our nature to do so.
What do you base that on?
In one study of WWII soldiers on D-Day, half didn't shoot their weapons because they didn't want to kill someone (my memory of the study is vague). The military had to develop training to make soldiers more likely to kill.
mmooss
> People killing people is one of the better-documented aspects of human history. If it's really a commonly-held idea, it's a delusional one.
Lots of things are well documented. Famine is too, but it has a big negative impact.
Humans are social creatures that live exclusively in groups; they cannot survive alone psychologically or, usually, physically. Groups are effective when they are at peace; evolutionary psychology, at least, supports not killing each other.
A universal aspect of every human culture is a taboo against killing.
maoberlehner
> A universal aspect of every human culture is a taboo against killing.
Exactly! It's taboo. It's morally wrong. It's unethical. But does it make it unnatural? It's taboo to talk about sex and what you do on the toilet, two of the most natural and human things there are.
jwilber
You’re conflating social taboos with societal taboos.
readthenotes1
"commonly-held idea that killing is an 'unnatural' act for humans"
Say what? It may be one of the most natural acts for humans as far as history shows
kamikazeturtles
I don't think killing is a natural act. Most people throughout history died from disease, not war.
In the past, if you killed someone, like in a battle, there is a good chance you're going to die in the next battle of the military campaign. Few soldiers survived the military campaigns of the past. Maybe that's why we don't hear much about PTSD among past soldiers.
tbrownaw
> natural act
Most actions do or don't suit circumstances, rather than this being something inherent.
I might take lots of pictures outside at a festival or go pee inside a bathroom, but probably not the reverse.
(See also, the fundamental attribution error.)
sandspar
Huh? Rome had career soldiers. Don't quote me on the numbers, but a Roman soldier might see 2-5 major battles and dozens of dustups and minor skirmishes. They served for 25 years. Overall death rate was 25-40% but most of that was due to disease or accidents - due to spending 25 years walking around in the woods - not combat. And European medieval wars were fought by part-time soldiers whose main job was making money for their lord. If "few" people survived ancient military campaigns, why would medieval lords fight wars at all? Surely fighting a war isn't worthwhile if at the end of it you have merely a "few" employees left.
mmooss
Repetition doesn't make it natural. As I said elsewhere, famine also is common but not eating is not natural.
systemswizard
It’s a natural act for pretty much all animals on this planet
mmooss
Perhaps you mean only for predators?
> These findings contradict the commonly-held idea that killing is an 'unnatural' act for humans that inevitably inflicts a moral injury on the individual, the researchers write in Armed Forces and Society.
> "There is a widespread belief in society that taking the life of another person goes against human nature, and that this will easily create what psychotraumatology refers to as 'moral injuries'," said Nordstrand in a press release.
I had not thought that that belief was anywhere near as common as this seems to suggest.