Earlier quoted context omitted.
More freedom of speech is the answer to misinformation because then it can be challenged. Censorship allows convenient mistruths to spread unchallenged.
This assumes rational, reasonable and good-faith arguments and behaviour though; if there's a thousand voices (pushed by interest groups, foreign governments, advertisers, etc) pushing one narrative, what's a single challenging voice going to do? I mean I can invoke Godwin's Law, but we don't have to go that far back; everybody knew Trump was a terrible person and he should not have been eligible for the presidency,…
Firstly, the Nazis rose despite and possibly helped by speech laws.
> My new favorite wiki page (for now) is https://en.wikipedia.org/wiki/Paradox_of_tolerance
Secondly, Popper is not calling for speech to be supressed in any way except for those who choose violence instead of speech. The original[1] is better than a Wikipedia article that cuts off the important part of his words:
> In this formulation, I do not imply, for instance, that we should always suppress the utterance of intolerant philosophies; as long as we can counter them by rational argument and keep them in check by public opinion…
Hence he is supportive of the right to discussion for all. He contrasts this with those who won't support speech and sets the limits:
> for it may easily turn out that they are not prepared to meet us on the level of rational argument, but begin by denouncing all argument; they may forbid their followers to listen to rational argument, because it is deceptive, and teach them to answer arguments by the use of their fists or pistols
They've given up on speech so he gives up on tolerance, which is wise. Free speech is there to reduce violence and supplant it and nothing Popper wrote in the "paradox of tolerance" contradicts that.
[1] https://archive.org/details/TheOpenSocietyAndItsEnemiesPoppe...