The reason censorship is generally undesirable is because it assumes the person doing the censoring is always correct, and that they're infallible perfect arbiters of truth incapable of letting their political motivations dictate their censorship decisions...which is of course false. They're very often wrong, and always make decisions based on their political leanings, even when it contradicts the evidence.
Free Speech has nothing to do with whether information is correct or not. It's only about stopping Tyranny. No one should be allowed to control another person's speech because speech is the most basic form of freedom and if you can remove speech freedom you can remove all other freedoms too.
Removing Freedom of Speech is the first thing Tyrannical gov'ts do to control people. Look at what Trudeau tried to do to Canadians, and look at the UK also. People are now being put in JAIL for being rude online. Luckily conservatives all around the world are fed up and finally fighting back.
” But when men have realized that time has upset many fighting faiths, they may
come to believe even more than they believe the very foundations of their own conduct that the ultimate good desired is better reached by free trade in ideas-that the best test of truth is the power of the thought to get itself
accepted in the competition of the market, and that truth is the only ground upon which their wishes safely can be carried out. That at any rate is the theory of our Constitution. It is an experiment, as all life is an experiment.”