Consider people like Alex Jones. He’s still making stuff, his hardcore fans still subscribe to his stuff, but he’s lost all of his marginal followers as well as the massive on-ramp that YouTube provided him in the form of search and recommendations.
https://www.vice.com/en/article/bjbp9d/do-social-media-bans-...
Websites that are predominantly extremist content because the only people using them are those banned from all the major platforms don't tend to succeed.
With people on the right, Parler is very well known. There are a pretty large number of celebrities and politicians - and unlike Gab not merely people who were dumped from other social media platforms.
Anyone who would censor another person qualifies as a hateful extremist in my book.
Let's take an extreme example of someone almost everyone agrees was a hateful extremist -- Osama bin Laden. Prior to his death, should he have been allowed to post on Twitter encouraging the murders of more people? Would Twitter have been a "hateful extremist" for banning him and other Al Qaeda accounts? Or -- and here me out here -- would it have been acceptable to ban him? If so, then there is a line somewhere. And if there is a line, then why shouldn't modern day Neo-Nazis calling for the deaths of Jews be on the other side of the line as well?
Death threats are already banned from facebook unless their against celebrities / politicians - which to me is a weird distinction to make.
And if you're willing to defer to Facebook's judgment here, then the problem is solved. Holocaust denial is banned from Facebook, same as death threats. Discussion resolved. We're in agreement.
Also this has recently happened with many Twitch streamers. Destiny, Vaush, Sargon, and others got deplatformed and moved elsewhere.
One could argue that Andrew Wakefield, the founder of the anti-vaccine movement, has found/made a stronger platform after losing his license and being publicly denounced than he ever had as a doctor.
If you live your life by moral imperatives such as utilitarianism/the veil of ignorance, then you will in fact be compelled by moral imperative to denounce people whose views do not lead to doing the most good for all (as e.g. is true of anti-vaxxers).
Also, to my knowledge, what you said is incorrect. It is perfectly legal to debate the legality and ethicality of pedophilia and vaccination. It is not legal to advocate for them, but advocation and debate aren’t the same thing. For example, the Wikipedia articles on Holocaust denial steelman the opposition quite well but no one would accuse those articles of advocating for denial of the Holocaust.
However anecdotally, I was a part of the occupy movement back in 2011. A large part of our spread was to stay on the street and deliver propaganda. After we were de-platformed by the police using various scare tactics (including arrest) our spread was heavily restricted and the movement quickly died. It seems to me that these tactics of stopping our spread by the police were pretty successful.
https://news.ycombinator.com/item?id=24754897
Refutation is not predicated on first disseminating the hatred as widely as possible.