You would be surprised. Some of the most terrible people in the Nazi concentration camps were fellow prisoners tasked with being Kapos (prisoner overseers). The

You would be surprised. Some of the most terrible people in the Nazi concentration camps were fellow prisoners tasked with being Kapos (prisoner overseers). The Kapos were spared some of the worst labor but in exchange had to show extreme brutality to the prisoners they oversaw so the Nazis wouldn't question their effectiveness. This isn't the only example: Stanford prison experiment and the Milgram experiment. I'm sure there are others. When you value being alive many people will do anything to survive.