It's not quite that simple - not only can absolute free speech be absurd (a condition I don't really care about to be honest, untruth will always be prevalent), but it can be actively dangerous: free speech can include terrorist radicalisation, trying to convince people to join perform suicide bombings or shoot up churches. Much of the far right radicalisation in recent years has occurred in Internet forums.

That's not to say that the answer is obvious, but the current setup that we have where only the most egregious speech and harassment is explicitly banned and social norms are enforced by social pressure seems to work. I think a lot of people advocating for free speech are ambiguous as to whether they're arguing against explicit censorship or against social pressure, which can obscure the conversation.