Sure, playing chess needs intelligence, dedication, and good chess players are smarter than an average person. But it’s waaaay exaggerated in movies. I’m a math researcher, and in any movie, my department will be full of chess geniuses. But in reality, only about 10% of them even play chess.
I don’t think a minority of rightwingers are dumb. I think they’re invested in their idea of their team, and any insult to their team is an insult to them. They root for Trump. It’s like that one guy you know who owns a lot of Lakers memorabilia despite living in Texas. The media, expectations, their own investment, the threat of being wrong or misguided, “Me? Never!”, vastly outweigh any sort of critical thinking. Its straight denial to the core.
But a vast majority? Yeah, dumb as an absorbent trash bag.