Moderators on HN decide all the time whether a post should be deleted or not. Why is this a problem if it's on Facebook or Twitter? I don't see why anybody ev

Moderators on HN decide all the time whether a post should be deleted or not. Why is this a problem if it's on Facebook or Twitter? I don't see why anybody even the president deserves a private platform. If he doesn't want to be censored he can make an official press release like every other president has in the history of the presidency.