2/3 comments are readable, one isn't even downvoted.
In addition, flags are generally user imposed. a Mod can flag whatever they desire, but enough users with enough karma can flag a comment, and enough flags will auto-flag until/unless a mod overrules it.
Neither of these are "censorship", even in the colloquial sense. One means someone disagrees with a comment, another means that it doesn't adhere to the spirit of the site.