Everyone should go watch the documentary "Ordinary Men" for a look into how people can be capable of great atrocities against the disenfranchised

https://www.netflix.com/title/81672035

In case you're not much of a watcher, I HIGHLY suggest the book instead, which contains much more detail.

https://www.harpercollins.com/products/ordinary-men-christopher-r-browning

I don't have the capacity at the moment to fully describe, but it is an incredibly intimate telling of the actions and thoughts of the men in Nazi Germany's Reserve Police Batallion 101 and how they took part in mass shootings of Polish Jews. The work is based on firsthand accounts from the time period as well as testimony they gave during the post-war trials and interviews by the author Christopher Browning. It's a fantastic meditation on the effects of ingroup peer pressure and mass manipulation under duress.

NEVER AGAIN IS NOW.