Fine by me, there's enough hatred in the world already, go express it to a shrink, instead :-)

Some do, I'm sure, and I guess someone who posts normal stuff under their name and insane stuff under a pseudonym probably counts as "self-censoring," in a sense.

I don't see how this can be true overall, though. Ten years ago, the time the grandparent poster mentioned, was about when I was realizing that even though the election was over, people I'd known all my life weren't going to stop posting (under their own names) racist Obama memes on Facebook or Twitter, implicitly daring the still-sane people to call them on it. Things haven't improved notably since then. It's not something I think about a lot but my sentiment about internet dialogue over the past decade is definitely not hey, look at all the self-censorship going on. People are clearly concerned with how their comments will be perceived in the future.