Why exactly would people want to share a space with racists, antisemites, and every kind of vile hatred? Why would you not go to place that does not accept that kind of utter garbage instead?
It just seems evident to me that unpersoning them will force them in to a place that reinforces their own ideological biases which would make them more radical, and with being a social outcast, they'd have nothing to lose.
It's practically an axiom - in any community without iron-fisted moderation and gatekeeping, the original hard core will end up complaining about how great it used to be before all the normies invaded.