“ The point I think is this: Pseudonyms are not in themselves harmful. Yes, they can be used for harm, as when people use them for anonymous, slanderous attacks, trolling, etc., but in the vast majority of cases there is no harm done. Importantly, they can serve to protect vulnerable groups. There’s even a comprehensive list of people harmed by Real Names policies. In the cases where pseudonyms are being abused, it is the harm that should be stopped, not the pseudonyms. To my mind there are three categories of Pseudonymous behavior, and they should be treated differently:”
Source: caterina.net