I think The Atlantic is actually pretty close to the mark. Committed, hardcore ideologues frequently turn out to be authoritarian, even if they refer to themselves as "anarchists". Most of these ideologues are busy administering ever more stringent purity tests to anyone they encounter lest someone in their vicinity commit wrongthink.

There is a name for people who build coalitions through compromise and diplomacy, and work towards pragmatic solutions to actual problems — they're called "centrists".