They also are placed into the rather difficult position of making complex judgements about what constitutes deviant behavior. For example, when is an avatar TOO obscene. Supreme court justices have a hard time with that one. There's a lot more to say about deviance, but let me add just one more point. Much is being said nowadays about how anonymity on the internet tends to act as a disinhibiting factor.
People act out more, regress, and are more sexual and aggressive when no one knows who they are.
I believe this is true, but I think it's important to give this idea a slightly different spin. Rarely does someone wish to be totally anonymous, invisible, without any name or identity. Everyone wants and needs to express some aspect of who they are. The internet offers the opportunity to hide some features of your identity, while expressing others. People who are acting out sexually and aggressively are expressing a need, an aspect of self.