If the "actual left" is "currently focused on building alternate power structures for when the US government inevitably collapses" - how would you define far-left? What are they doing?
I would define “far left” as revolutionary communists, of which there are very few and they’re mostly very young people on Twitter. But the few actual revolutionaries I know are doing the same crap as the right wing militias, there are just a lot fewer of them.
Your average leftist is simply disillusioned with electoral politics writ large; they’re tired of voting for guys like Obama who promise change but then still spend a trillion dollars turning brown children into skeletons. But there’s absolutely a feeling that we’re running out of time and more drastic solutions are on the horizon.
Some join something like DSA which still nominally participates in the electoral system and others build mutual aid networks to circumvent capitalist control.
