Yeah, Moderation on a tiny corner of the internet on a fansite. That is not the rules of the internet, nor does it stop or prevent people from being assholes. Infact, rules like moderation are why some people keep breaking them, because they exist.
Edit: And you know what? When people are forced to use their real names, there will still be assholes. There are assholes in literally every fucking corner of life. If you can't handle that in the 15+ years you've been on the internet, then you should probably take a break, or maybe, just maybe, get a life =)