I think it's the other way round. Anonymity (or rather: the right to present different personas to different audiences and to give up a burned persona when you see fit) makes the internet a bearable place. It also allows people to make up their mind without standing in their own way, and disregard hurtful comments as trolling (which they often are). Facebook painfully shows that real name policies do not necessarily lead to more civil discussions, instead they facilitate ad hominems, and expose vulnerable groups to hate everywhere, as aspects of their identity can not be selectively hidden anymore. This even extends to their real lifes, with their names being publicly known. Now speech needs to be controlled, because people lost control of their personas and need to fight everywhere, instead of just when they choose to.