It's not about whether Joe Rogan speaks the truth or not, just that he can speak it. "The Truth" shifts around constantly, and it is very hard for anyone to really pin it down. So as long as the speech isn't deliberate fraud or slander we allow it, even if we think it may be wrong or misleading.

The great thing about freedom of speech is the ability of anyone to say something that mainstream consensus or the powers that be don't like. I find the fact that Rogan is able to speak his mind and that powerful people don't like it and cannot stop it deeply gratifying. I hope he keeps it up!