Free speech
Whether it's: twitter bans; facebook jail; cancel culture; or, political correctness in general, I think speech should be unlimited.
I have no problem silencing someone when they are inciting violence or threatening the peace, but censoring someone just because they're being "mean" is unacceptable.
Censorship does more harm than good, and even though the first amendment only applies to the public sphere, out of principle, I wish more people valued it as much as I do.