Literally every violent conflict is filled wth abuses on all sides.
Having mercifully never been in a war, I don’t know how it feels. But it’s easy to see how individual soldiers just snap, and do completely unhinged shit.
For example we all agree the Nazis and Imperial Japanese were despicable. Yet learning about how Allied soldiers would execute prisoners, extract body parts (teeth, ears) as trophies, and so on, really brought home to me how even the most “necessary” wars, even in self-defense, are grotesque perversions of human nature.