If we're going down that route: You're making an assumption without any proof: Pseudonyms lead to bad behavior. In my world that's not connected to the names

If we're going down that route: You're making an assumption without any proof: Pseudonyms lead to bad behavior. In my world that's not connected to the names used and is merely a function of the 'quality' of the people in your community. Also - you don't solve issues between people with rules about their 'alias', you have to invent/support/hand out some decent tools to block idiots from your online life.