The people who just now realized that Trump is a fascist aren't "on the left". They are NPCs. It doesn't matter what anyone says about them or to them, the world will literally end before these schmucks lift a finger to fight it.
The idea that "concerned centrists" exist to be convinced with Discourse not to support fascists is literal thought poison. Anyone who was going to resist Trump has already chosen sides. Everyone else is just a passive observer or a literal enabler (instead of whatever you think that term means).
Make no mistake, the time for discourse is over. Whether the American antifascists continue the fight illegally through direct action or bend over is up to them. Historical precedent (Italy, Germany, Russia, Turkey, China...) doesn't favor victory, but I would love to be proven wrong. However the idea that you're doing anything by appealing to the most politically disconnected's hearts and minds is laughable.