When one of my kids was in 8th grade, she had to write some kind of report on WW2, she chose the camps. So we went to the local library (I lived in a serious backwater location) and got out every book they had on the camps. This was mid 80s, the titles I remember were Babi Yar, Anus Mundi, Sobibor, Treblinka, Dora - there were a few more. I stayed up late for many nights reading every word.
When I finished, my over riding thought was:
It WILL happen again. No doubt about it. People are much worse now then they were then.
Worse? Perhaps. I’m inclined to think no different.