No, because we'd still be, you know, not racist.

But I think suppressing a viewpoint is counterproductive. Instead, the holders of those viewpoints should be held to the light, and it's a Twitter problem in that such people can be completely anonymous or even fake. Hard to have a public debate when some of the participating citizens are fictional.

The arguments for the US constitution in the Federalists Papers were presented pseudonymously. Debate doesn't require some silly real names policy.

Yes, and no? Proposing racial segragation is something is highly offensive to non-white people, discriminatory in and of itself. If you're an employer, letting some guy talk about his beliefs in racial discrimination in your workplace is creating a hostile environment for your other employees. If you have any kind of position in a community, you shouldn't allow it there either.