> Even if private censorship is allowed, that doesn't make it a good idea if it causes people to leave for some Voat-like cesspool where they won't encounter ordinary people anymore.

Absent access to "ordinary people" to recruit to violent causes, the inhabitants of such a "cesspool" will likely bore of their own conversation.

If, as you state, any of them are engaged in illegal provocation to violence, they will be easier to find there, since they lack the shield generated by the noise of "ordinary" conversation.

Besides, nobody is going to "helped" away from violent provocation by casually interacting with them social media. The only thing that can help such people is real in-person and trusted interaction, like at church, with a community help group, or with a therapist.

At best social media can be used to identify candidates to be offered an off-ramp from the road they are on, but that needs to be done by people who do de-radicalization as a full time job or mission, not casual social media acquaintances. Very few people are dedicated to that kind of work today.