There's a difference between self-control and a chilling effect on speech, though. I see no problem with someone being mindful about what they are saying and how they are saying it. I do see a problem with someone self-censoring a discussion or expression of an idea because of fear, especially fear of the government, or fear of other damage to their lives.

If people are afraid to express ideas simply because those ideas aren't popular (even if they aren't very controversial) I think the quality of discourse is lowered.

When a not-out member of the LGBTQ community can't enter a discussion or express something because doing so would tie that to their real name, having to self-censor because of a lack of anonymity becomes a problem.

I don't know that there is a perfect solution, either. Having full anonymity introduces other problems.