Your argument doesn't really make any sense because everybody here is talking about speech in the context of a walled garden owned by a company/person. That is a completely different situation than what you are alluding to. I can just as easily prevent the reverse question: I have a blog with a comment section, and somebody I don't know posts a horrific, rude and distasteful comment that I don't want associated with my blog post. Can the government force me to not delete that due to free speech, or do I have the power to moderate my blog however I want?