I used to think that was a good idea too: sequester 4chan, make it the sin-eater of the internet at large.

But as we learned through 2014-2016, from Gamergate to the alt-right to MAGA, 4chan didn't need to break for them to go elsewhere. And not just elsewhere, but everywhere. A single 4channer could make multiple reddit accounts, twitter accounts, and fake facebook profiles. But what allowed their work to reach larger audiences was to use /pol/ to coordinate their brigades across the internet. 4chan's anonymity and lack of persistent logs made that easy.

Russian state actors infiltrated their ranks as other anons. As obnxious trolls looking to get a rise out of people, they had huge blinds spots and failed to see this for what it was (or looked the other way). Once installed, they could launder propaganda by making it look like it was coming from seemingly American sources, all across the internet, all at the same time. The anons were Putin's useful idiots.

The argument of sequestering the social pariahs to 4chan implies they are physically locked up there, imprisoned but satisfied, uninterested in engaging the internet at large. But clearly that isn't true. You can't leave the Nazis in one corner of the bar - it becomes the Nazi bar. If you want to fight them, you have to remove them from the common spaces, and then remove their own spaces. Unfortunately, the cancer of fascism has metastasized all across the internet, now originating from people who have never heard of "this four chan." Fighting that is going to require us to stop falling for the paradox of tolerance and start kicking the Nazis out, whether we have laws to do so or not.