It also shows how social rules are not absolute and can and need to be adapted to the situation.
It's also a social norm not to show yourself naked in public, but if your at the doctor's and it is necessary, there's an exception.
But in some religions, this is not considered reason enough to undress. Morals are a product of time and place.
Obviously, with something like killing a person it's different. It's a threat to the community.
However, in a war, the immediate community around you already is in disarray, so everyday rules don't apply anymore.
But that makes it also hard for individuals, they have to overcome their rule-set and make up another, "war-time rule-set" for themselves. That's when things like looting and rapings occur - if it's okay to kill someone, every rule regarding lesser crimes may become questionable to the individual as well.
It's difficult, but that's what philosophy is for.
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I can read facial expressions. I did the test.