Nżtt milgram

http://mic.com/articles/92479/psychologists-have-uncovered-a-troubling-feature-of-people-who-seem-nice-all-the-time
People who were normally friendly followed orders because they didn't want to upset others, while those who were described as unfriendly stuck up for themselves.

The study also found that people holding left-wing political views were less willing to hurt others. One particular group held steady and refused destructive orders: "women who had previously participated in rebellious political activism such as strikes or occupying a factory."