Holocaust

What can we learn from the massive size and scope of the Holocaust? What does it teach us about:
a. The scale of prejudice and indifference, and
b. The fatal potential of our own institutions today?
Hilmmers speech:
https://www.facinghistory.org/holocaust-human-behavior/himmler-speech-posen-1943
death camps:
https://www.youtube.com/watch?v=zC8fcjLvid8&t=862s
one day in Auschwitz:
https://www.youtube.com/watch?v=mZYgzW2fS0o&t=2299s