> This is precisely the problem. That core will certainly get more extreme because there's no cross pollination between it and other more moderate groups.
But the question is how much? I'm highly skeptical that "cross pollination" moderates hard-core neo-Nazis to any significant degree, for instance. They might get a little more extreme in an echo chamber, but I don't think it will be that much more.
In fact, I think the "cross pollination" mainly goes the other way, by spreading extremist ideas to moderates that are vulnerable to them. Let them spread enough, and they could even become normalized.
> I would rather have more people with less extreme views than fewer people with more extreme views, because it's much more likely the more extreme people are a greater danger to society than the less extreme people.
I think the better way of thinking about this is "total quantity of extremism." You're always going to have a hard core, so the question is more about how big will that core be, and how many adjacent supporters will it have.
Let's say you keep neo-Nazis on twitter, and that leads to a hard-core that is 10% less Nazi, on average, but that's also ten times larger. You now have a far more dangerous situation on your hands.
> True, but it's more complicated than that. Extremism almost always results when you disenfranchise or ostracize a community. It's much better to integrate it so there's crossflow of information and empathy still. Dehumanizing groups of people also dehumanizes yourself.
Maybe in some cases, but not others. For instance, neo-Nazis extremists weren't created by disenfranchising some kind of "moderate" natural neo-Nazi community.