Cops usually are the same ones driving BRo trucks, or its likely their kids like you said.

I do like the box of nails idea though. Keep a flimsy cardboard box of roofing nails in your door pocket for tail gating assholes :)

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.