You acknowledged limited and narrow cases. Taking even one example, there are a number of transgendered people holding conversations on online forums anonymous

You acknowledged limited and narrow cases. Taking even one example, there are a number of transgendered people holding conversations on online forums anonymously or pseudonymously because of potential IRL consequences if people they knew linked them to the posts. Giving these communities this sort of safe haven is worth all of the asshole anonymous posts we see across the web, and they're only one example.