/r/altright was banned for doxing. An example can be found on imgur http://imgur.com/a/pZ8yN where you can see not only doxing, but crowd funding to support doxing of an individual they disagreed with.
The ban also seems slightly prejudicial, because on the other side there is /r/antifa where people are bragging[1] about the assault which /r/altright was trying to solve with this bounty. Granted, /r/antifa seems to be mostly dissent against this stuff, so it wouldn't be a subreddit shutdown.
I think that assaulting people you disagree with is a far more serious charge than posting a reward for information which leads to the arrest of a criminal. The latter is something befitting of a police agency.
I don't think you have to be a neo-nazi to appreciate how pathetic and sad antifa are. I do not think you have to be a neo-nazi to have a knowing laugh about the thumb-sucking intellectual fragility they represent.
>Vigilante justice often describes the actions of a single person or group of people who claim to enforce the law but lack the legal authority to do so.