I have been thinking about this and I have been a victim of a witch hunt. I have been part of one and I felt guilty my whole life for it.
I was 8 and a gang of people at school decided to go around chasing a girl around the playground calling her names. I remember finding the being part of a gang thing and not being the victim great at the time. We then all got called in by the teacher who explained how it felt for the girl, I still remember her name, it was Karen. I felt so bad for her and very guilty, I never did anything like that again and was very nice to Karen from then on.
I do not understand why any adult would do this to another human. I know some people have untreatable personality disorders be that APD or NPD. Those people do not make up more than 5% of the population.
What I do not get is the adults that join in who don't have a personality disorder as an excuse.