It has already been mentioned that banned users' "ban-worthy" comments are censored.
I'd have to run an operation on lobste.rs in order to make a point and then maybe the non-representative examples I do capture are of people actually going crazy.
HN hides "dead" comments for unregistered users but at least registration is open.
This way I can know that some user was unknowingly making ill-informed claims about the extent of the contributions of the author of the linked project to certain products as opposed to any of the worst-case assumptions one could make from the replies.
> [censored]. Oh, you know who also [censored]? [censored]? Exactly!