I pass no judgement about what a man must do in the heat of combat. But I do so on a military person who murders non-combatants in a situation where it is not the heat of combat.
I understand the bombing of German and Japanese cities. I understand machine gunning Japanese troops in the water whose transport was sunk with Japanese held land nearby.
I can find no excuse for what the Soviets did to Polish officers in the Katyn Forest, just as an example.
And what Germans did to Russian soldiers and civilians.