[flyinRyan]

>We know that people behave better when they're accountable for what they do and say, and worse when they're not.

What you're saying here is that people conform to social norms better when they can be "held accountable" for not doing so. Now imagine some of the unhealthy social norms of the past and how people were "held accountable" for violating them.

Anonymity has a cost, but it is a cost that must be paid or we do not have a free society in any sense of the word.