I feel like I strongly disagree with your position, but maybe that's because I don't really understand your position.
You mentioned that there is an objective right and wrong, and that when we got away from that, we started having problems. As a Christian, I can understand that perspective.
However, I am thankful for freedom of speech, because without it, I would have to hope that whoever is in power agrees with me. And I certainly couldn't criticize the leaders, or I'd be punished. Without the freedom of speech, we are susceptible to propaganda, and the insistence that the truth is a lie.
Just like the right to bear arms, and the rest of the constitution, freedom of speech is there to protect us from tyrannical government.
But since we're talking about privately controlled free speech - they still have a way of punishing us - Banning you from their platform. Propaganda gets to go unchecked, and it influences public opinion. If people are freely allowed to discuss everything, then the truth can be called the truth. The drawback is that people will still come to wrong conclusions, believe lies, and say hurtful, harmful things.