You brought up human rights in the context of this discussion more than once, what else are we supposed to take from that, than that you think 'human rights' are remotely relevant to the topic of banning nazis from reddit, which they aren't.
Reddit is just another brick in the wall. They can do this. Indeed, perhaps they should. But should we cheer it on? What happens when there are no reasonable means left for the deplorable to speak? What happens when censorship isn't fraught, when empathy is eschewed, when due process is forgotten?
Those are not Reddit's responsibilities. They are our responsibilities, as a society. It is very much a human rights issue, but not Reddit's sole responsibility. Right now, registrars refuse to even host domain names.
I'm not saying these are good people. Quite the opposite, really. Cheer the censorship on, it is your right. I'll stand up for your rights too.