That is a good question for which I don't have a good answer. A good first step would be to stop celebrating the aftermath of these actions. As to the racists part, I haven't personally seen the explosion of racism linked to free speech that keeps ketting implied. I suspect that some of this is hyperbole. This line of thought implies that ultimately anyone who seeks out a free speech platform is a racist or supports racism. I think this is dangerous.
I'm curious what platforms you're on that don't censor things where you haven't seen some bullshit stuff. I haven't sought out any free speech platforms.
I also don't think that line of though implies that everyone is a racist. The previous comment just implies that racists will seek out these platforms because it is the only platform that will accept them. Not that everyone who seeks these out are racists. Just enough racist and shitty people who got kicked out of the larger platforms will slowly fill up these free speech platform