Forcefully ejecting Nazis, fascists, Gamergaters, and their fellow-travellers from our communities, is both the morally correct thing to do and deeply practical.

Does not (always) follow. The point is a peace treaty between between who do not otherwise get along. Obviously some of the people you are talking about are provocateurs, but if by "fellow-travellers" you mean people who have principled objections to your own ideology, then you've missed the point.

Edit: also, please see https://medium.com/@maradydd/when-nerds-collide-31895b01e68c