If you study war you will find so many horrible things. Most of them are never reported on, even huge events in modern times. Few people in the Euro-American news media stream are aware that during the Kosovo war---the largest land battle in global history took place. Largest number of tanks. Largest death toll in a single day. I challenge you to find out where that happened.

I suppose you may not think that WW2 was modern times. But the rape of Nanjing is beyond anything else. It makes Oct 7th seem like a tea party by comparison. It was as if Oct 7th continued for a couple of months with a large, mechanized army. Civilian deaths at least 200,000 and probably much higher. Rape and rape-murder was at least 20,000.

Yes, people forget. Everything is forgotten in time. And no people's hands are free of blood and bones in their history, just as none are free from slavery. Each generation springs anew, innocent of the awful past of their forebears. Some generations will be horrified and shocked at what humans are capable of doing.

Some commit horrors because their religion/ideology tells them to. Islam does this. Some commit horrors because of a belief in their ethnic superiority, looking down on those they slaughter as underpeople not fit to live. Some commit horrors for strategic advantage: "Shock and awe." (Shock and awe never works unless it causes near annihilation. But generation after generation of leaders come up with this sort of idea and think they thought of it first and that it is how to win.)