When in Germany, I lived in the barracks used by the SS Batallion that guarded Belsen. The memorial was at the end of the garrison, where the concentration camp used to be. My first visit there was pure curiosity, and it was very surreal to me. As in, how could this happen to so many? My second visit, a couple of months later, was more of a quest to answer my own question. Obviously, I couldn't as I don't think my brain could handle it.
Yes, it is impossible to grasp mans inhumanity to man, the first and second wars were fought with part of the motivation being, it would be the last war but some how, the human race never get's the message?
But I remember reading some research with dogs, they were kept in a large compound isolated from humans, and it took one generation for them to revert to wolves.
Another piece of research about inflicting pain.
One group of people were told if they pressed the button on their desk someone in another room would get a painful shock, they had loud speakers to here the ,'victims' pain.
The second group had a light and microphone on their desks, and were told to imagine, when the light was on, the worst pain they could remember, and make appropriate noises.
Of course the buttons of the first group worked the lights of the second group, and the microphones connected to the loud speakers.
The two groups did not know of each other.
The first group were given instructions when to press their buttons, many were reluctant at first but soon they were mostly happy to press and listen to the pain while some started unprompted pressing.
In the early stages (to encourage button pressing) they were told of, 'crimes' the victims, 'may' have committed. (no smoke without fire or in a motoring context no rust without water?🙂)
When I think of the button pressers I think of social media!