Having spent a few years on the Fediverse, I've found that "the left" in the US consists mainly of book clubs and struggle sessions.
The book clubs just read and debate theory ad nauseum. They're a joke, and if you gave most of them an AR-15 they'd shoot themselves in the foot.
The struggle sessions look for people slightly less poorly off than themselves to bully. If they can't find a right-winger, they'll happily go after somebody who's only 99.999% on board with their program. Failing that, they'll pick one of their own at random, accuse them of insufficient ideological purity, and bully them. They're a joke, too, only not quite as funny as the book clubbers.
Fuelling hellflames is against the site guidelines, which ask you to flag egregious rather than replying to them (a.k.a. please don't feed the trolls).
We're trying for something else here than internet default and need users to know the intended purpose and stick to it.