One thing to keep in mind is if these chucklefucks torch the economy then the capital class will hang them out to dry. One big strike would end every single one of their ambitions. Arming yourselves won’t do it, you gotta organize.
You can’t pay soldiers and police when you have no tax revenue.
They’re feasible with a voter mandate. You get that mandate by building it in your platform and getting elected on it with sufficient margins. The Democratic party, however, is not a revolutionary party but a status quo party and refuses to go that route because they’re afraid of losing. So they just lose by default.