Which is exactly why we need to uphold classical liberal principles, as well as speak truth with appropriate nuance.
The best way to deal with a bad idea is with a better idea, not by silencing the bad idea.
I'd have a lot more respect for Google in this case if they, in collaboration with researchers and experts, produced their own well-researched, nuanced, carefully stated arguments against what they disagree with.
[citation needed]. Popper's personal opinion that you linked to (and that is now used in a much more absolutist way that originally intended by its author, who never intended to cheer for censorship and crackdowns in name of democracy) isn't data and Full stop isn't a proof. Yes, Popper was smart. No, he wasn't an oracle of unquestionable wisdom.
Tell me, how was legalization of marijuana in the U.S. won? After all, chucking people into prison for decades is quite some intolerance. Did the MJ lovers stage an insurrection?
No, they won at the ballot box, which is the tolerant way. Not by reverse oppression of their enemies.
To disprove a sentence that says "every time", one example to the contrary is enough. This is your example. For another, take gay rights. There wasn't a gay revolution that would smite the religious conservatives and crush them.
I'm not proposing full tolerance of the intolerant. Rather, as Karl Popper explained, political institutions within a liberal democratic society are the most appropriate scope within which the people's will regarding what to tolerate is expressed. In other words, contact your representatives about what needs to be outlawed, and until something is outlawed, show liberal tolerance—which absolutely includes refuting bad ideas in public debate.
Regarding YouTube, their choice to deplatform people is their choice -- and it's not against the law, since they own the platform. I certainly disagree with the wisdom behind their choice. It's likely to cause more problems than it solves; but I'm tolerating it even as I argue against it in public debate.
(also, I didn't downvote you)
How would you say that people sharing information about vaccines and their effects are intolerant?
How would you say that people not wanting to get vaccinated are intolerant of any particular demographic group? That's not targeting anyone by race, gender, sexual orientation, religion. It's a decision for them self about their person.
The first instinct of an autocrat is to strangle free speech of his critics. This has been the case since forever.
For all their errors, societies that do have wide freedom of speech rarely lapse into tyrannies on their own account. The freedom to say that the emperor's new clothes are bullsh*t is precious.
As for your historical examples, Weimar democracy was deeply flawed in that it tolerated party militias and a lot of violence in the streets. Once people are threatened physically, they will seek 'protection' from gangsters. But violence is something very different from actual words.
And China isn't a case of a democracy that was taken over by cunning speeches of its enemies. CCP got into power by winning a civil war.
Democracy and liberal freedom is best upheld when (a) the government is founded on the principles of liberty and rule-of-law, and (b) the people treasure those principles and refuse to tolerate a government that fails to uphold them.
I think most Americans are delusional and think "the good guy always win" because of the outcomes of WWI and WWII. The fact that Nazi Germany existed at all, or that democracy is non-existent in the second largest economy in the world should tell you that it's just not accurate to pretend that only the fringe of the population buys into propaganda.
53% of registered Republicans still believe Donald Trump won the 2020 election based on nothing other than propaganda... I think you underestimate how fragile Democracy is and you don't need to look much farther than Moscow.