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
The witches, the commies, the nazis, the apostates etc. that people feel morally justified to destroy at all costs. Moral superiority thanks to the ideology du jour is one of the most insidious and hard to fight social forces that brings the worst out of humans.
The Gulag Archipelago should be mandatory reading for contemporary generations that weren't born in a totalitarian regime and want to get a taste of where blind following of ideology can get them.
Surely you can pick the odd one out here.