I don't argue with the points you are making, but.. it is also simpler than that. Humans don't have to be "broken" by being a witness or victim of the violence of war themselves to do horrible things to other human beings. I mean, in the US in each of the past couple of years, some 20,000 people died in gun homicides. And hundreds of thousands were victims of sexual assault. And none of those were done in war.
We are doing horrible things to each other, even without war. So, when horrible things happen in war, maybe we should not place all that blame on the war itself.
Yeah, kind of hard to miss the systemic manufacture of a culture of denial and potential atrocity in US politics.