Seriously, if any of you "very serious people" want some advice on what you can do to stop the fascists, I think you entire approach on how you talk to them needs to change.
You're starting from the idea that these people are dupes, primarily because you are NOT a fascist, so you don't really understand how people can KNOWINGLY choose fascism - thus you assume grandpa has been tricked.
This is not so, no matter how much they lie to you about it.
@AnarchoNinaWrites Yes, here in West Virginia I point this out to the few of us who aren't right-wingers -- these people cold-bloodedly like the idea of suppressing minorities, anti-semitism, ejecting immigrants, etc.
Note that these folks have always been here. I saw the hate in the 1990s. Trump didn't create them, he simply unleashed what was already here. So trying to reason with them is pointless. They've held this position for decades.
