Trump won because Americans are that dumb

This is poor analysis. This doesn't explain why people become "dumb" or receptive to fascism. It has no notion of the material causes of fascism - lack of education, crumbling infrastructure, economic austerity, withheld wages, unaffordable healthcare, etc... Its a tautology that says things are bad because people are dumb and people are dumb becsuse things are bad.

If you truly latch on to this analysis, your only recourse is fact checking, appeals to reasons, and appeals to media literacy. How have those pushes been over thr last 10 years?

Fascism is capitalist crisis; it is not some nebulous "dumbing down" of an entire population through clandestine or otherwise paranormal means. Marxism teaches us to understand these issues from a "class" perspective as opposed to a "population" perspective.

Trump won because democrats preferred listening to republicans who were never going to vote for them over democrats who might have voted for them.