But you have your block user button. Serious question- why doesn't this suffice? Hitting block user a bunch of times is, to my way of thinking a small price to pay for freedom of speech.

You can't have progress and innovation without personalities that are extreme. Nature produces those people and some very small number of them take us all to place we never imagined and the rest are just waste.

It's the same thing with Free Speech. OK so a lot of it is waste and offensive. That's not its utility. It's utility is people using it to fearlessly think out loud. Even listening to Nazis has value to someone trying to understand what makes them Nazis. To defuse a bomb, you have to know the bomb from the inside out. Engaging with Nazis is the only way to defuse a Nazi. Marcuse's "repressive tolerance" isn't any form of tolerance, it's repression. It's the Marcuse's neurotic need to control other people and what they think because, like every fascist, he had no personal boundaries. That actually is a characteristic he shared with men from his era- Hitler Stalin Mao Mussilini. He looked and talked and thought in terms and categories like his "enemies"; the time makes the man, no big surprise.

Fascism has never taken hold in the US just because we have freedom of speech and the majority are reasonable. Where you did produce fascism in Europe is just where they banned freedom of speech. Silence is the sound of fascism finishing off the last of the resistance.