It kind of should... or at least I feel it should. You can't create the kind of communities mmos used to have without assholes. It's that little extra spice that makes the dish.
It's something a lot of games are doing wrong these days. You must had over control to the players. Mute exists for those who wish to use it but for the rest... well the world is theirs to do as they please with.
At the very least it should be.