I agree it's murky. Though I'd like to note that when you shift hateful ideologues to dark corners of the internet, that also means making space in the main forums for people who would otherwise be forced out by the aforementioned ideologues - women, trans folks, BIPOC folks, anyone who would like to discuss xyz topic but not at the cost of the distress that results from sharing a space with hateful actors.

When the worst of the internet is given free reign to run rampant, it has a tendency to take over the space entirely with hate speech because everything and everyone else leaves instead of putting up with abuse, and those who do stay get stuck having the same, rock bottom level conversations (e.g. those in which the targets of the hate are asked to justify their existence or presence or right to have opinions repeatedly) over and over with people who aren't really interested in intellectual discussions or solving actual problems or making art that isn't about hatred.

But yeah, as with anything involving large groups of people, these things get complicated and can be unpredictable.