I think SomethingAwful actuslly solves this problem eloquently, people are kes slikely to behave poorly when they pay for an account and have their name with site administration.
Alternatively i think building an invite only community by way of "web of trust" would also mitigate a lot of these issues.
I liked how SomethingAwful would let you pay to change other users' profile picture and/or title.
People would routinely change other users' titles to a representative quote from one of their earlier posts so every one of their posts was preceded with an excerpt showing how unhinged/biased/reactionary/etc they were.
Alternatively i think building an invite only community by way of "web of trust" would also mitigate a lot of these issues.