As someone with limited exposure to leftists outside the Fediverse I can’t confirm or deny that statement, so I guess I’ll just take it with a grain of salt, but it seems to me that there’s room for nuance between unquestioning participation in the system and unquestioning denial of the system.

As noted in the last-moment edit I slipped in, hoping to get it done before anyone read the comment, the non-insane (and much more widespread) version is harm reduction.

Here on the Fediverse, MLs and fellow-travelers of that sort are much more widespread than IRL, and they tend towards more… uncompromising positions. At least when their least-favorite bourgeois democracies are concerned.