> Radicalization is [...] about convincing the radicalized to undertake acts of violence and threats thereof for a political purpose
I haven't heard it used that way. Wikipedia, abbreviated:
> Radicalization is a process by which an individual comes to adopt increasingly radical political, social, or religious ideals and aspirations that reject or undermine the status quo or contemporary ideas and expressions of the nation.
As in, adopting extreme views. And that raises the question: if you have 100'000 people and tell them all to go read Mein Kampf, then some of them will undeniably go, "yeah that Hitler guy seems like a pretty smart fellow". What is the solution? It can't be to say that extremist speech should be banned. If so, we have to burn most of Western philosophy.
And it seems like "it is morally justifiable to use violence to achieve political means" is just another political belief, correlating strongly with the strength of your political views. So all you are saying is that some political views should be banned. I don't like this.
> And that the management is shockingly hands-off about letting them do it and have been for years now?
The management did nothing wrong. Each site has a different vibe. In the case of imageboards, it's usually 'anything which isn't explicitly prohibited by law'. It's worth noting that 4chan bans the behavior which you describe.
Even if they didn't, it raises an important question: where should the line be drawn?
It seems easy to think of 4chan or 8chan as a discrete entity, which should be shut down. But say that we had some physical entity, like a pub, which for some reason attracted an extremely racist clientele who liked to go have a few drinks and then beat up the immigrants.
Should the pub be held liable for this? What about serverless mailing lists, where I manually put everyone on the list in the "reply to" field, or Usenet? Should that be 'shut down' too?
The thing I don't like about this is that both counterparties are willing. If you're spamming someone, you have person A who sends to person B, but person B doesn't want to hear from person A.
With an imageboard, you have person A who sends to B, C, and D, but B, C, and D all want to hear from A. Should they be stopped in this endeavor?