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Free speech isn't a utopian ideal; most liberal ideals aren't. It is a principle that understands that the bad that comes from freedom of speech is completely outclassed by the bad that comes from opening up the capability to restrict it.
Give it a good thought: fascists wouldn’t label themselves as such. They will of course call themselves decent democratic socialists, and do it in the name of decent socialist values.
So to even try and make your point you’d need to back it up with: how would you ensure wolfs-in-sheep’s-clothing or the-well-intentioned-but-overreactive don’t use your “censor fascists” support to back door their way into the only world superpower with strong free speech laws and, well, end those?
And when a couple social networks have a vast majority of the users (social networks are literally network-effects) how is censorship on them not akin to a massive balance of power disparity that would reinforce itself? By the same logic of supporting banning voices from then you must admit they embody incredible power, even if they are private companies.
Then they came for the Socialists And I did not speak out Because I was not a Socialist
Then they came for the trade unionists And I did not speak out Because I was not a trade unionist
Then they came for the Jews And I did not speak out Because I was not a Jew
Then they came for me And there was no one left To speak out for me”
The poem literally speaks against their kind and a quick google search could save you the embarrassment.