> The foundation of Liberalism (I’m not saying left wing here) is that no one owns knowledge
This is complete BS to begin with. "No one owns knowledge" is a typical ideological statement without any merits or proof. It is an idea that you want to believe, that is based on nothing factual.
Yes, you can have opinions. Tastes. Ideologies. Beliefs. And they could be true, or false, or changing, depending on where you are and how you look at it. They are all subjective.
However, there are things in this world that are neutral to opinions and stands the test of time. Facts that happened in the physical world and mathematical knowledge, are two examples of such objects. They are the truth. They are absolutely correct. There is no room for "disagreement" because they are not subjective opinions. They are facts that can't and won't be changed.
Math is always correct. 100% correct. From day 1 they are discovered / invented till forever. Explicit assumptions and theorems that followed by rigorous proof are absolutely correct. You can expand it later, you can discover more, you can enrich math. But as long as it is correct, it stands forever. Every single second you are using technologies based on mathematical knowledge that was proved thousands of years ago. They never failed, and will never fail.
Facts, in the physical world, are objective as well. You can argue whether a killer is a good person or not, or how good/bad he is, but you can't alter the fact if he did pull the trigger and killed someone. That is a fact.
Physics, based on a wider set of physical assumptions, can be viewed as close to truth, because they have stood the test of time by physical experiments and phenomena. There is a chance that they are not completely true and will be subsumed by more advanced theories, just like Newton's Laws, however, they are close approximations to reality. That's how we get the rockets into the space. By science.
Now comes to my point. You have the right to express your opinions, even if they are harsh criticisms. But you don't have the right to spread false information that can be proved false by facts. You don't have the right to spread lies. You don't have the right to say whatever you want, however you want it.
Why? Because statements against facts are false, are lies, and spreading lies can hurt and cost others' lives, sometimes millions or more. This is why there is law against spreading hate speech, against spreading extremist ideology against human race, against fraud and scams.
Free speech is about being free expressing your opinions within the framework. Outside these boundaries, your speech becomes a weapon that can hurt others and that is not allowed by law and society.
The fundamental rule in the society is simple. You have every right about yourself, but you don't have the right to hurt others.