I just saw a play that has a plot point about how someone gets robbed by some racist, well connected shits, and the police won’t do anything to help. The closest he gets to justice is vigilantism, where he hunts down and shoots 3 of his assailants dead. Only then does anyone start to listen to him, but when he agrees to talk peacefully they shoot him dead.

I’m not sure “the only way you’ll get justice is with your own bloody hands” was the author’s intent, but that seems to be the message.

https://en.wikipedia.org/wiki/Do-gooder_derogation

Some people are very fragile and have poor emotional regulation. When they see other people doing good, it makes them feel bad, so they lash out.

Environmentalism, biking, veganism, all commonly evoke this behavior.