Agitprop

I think voting third party is good for signalling a lack of faith in the tired two party duopoly.

Unless you live in a swing state, it costs literally nothing to vote left of genocide, and the duopoly does track these votes and they can nudge future decisions. If you do live in a swing state, I think tactically voting within the duopoly shouldn’t be pre-emptively altogether dismissed, but considered case-by-case.

Even if a major crisis brings about the second overthrow of the duopoly, who will that party’s donors be? Almost certainly the bourgeoisie, and if not, it almost certainly won’t survive a second election.

Pre-revolutionary Marxists use the vote to develop their organizational & rhetorical skills, promote their messaging, and count their numbers, with the understanding that revolution won’t come from the ballot box.