Well I can accept that argument, it's interesting, but I think I want to disagree. I'm not American, I'm French and I live in China, and in both countries I know so well, the population seem to have many spectrums: young vs old, moderates vs angry, rich vs poor, nature-driven vs success-driven, tired vs energetic etc. So with all those dimensions, France ended up with 12 parties at the presidential election, from royalists to anarchists, going through greens, communists, centrists etc. China ended up with one.

France embraced the chaos and made it a point of pride, while China finds it absolutely terrifying and unproductive - but my point is that the population is exactly the same, scarily similar, in all its funny diversity, but the system is not a mirror of it, just an awkward model built on compromises: France wants to maximize representability and China wants to maximize order.

The US system is pragmatic: need to win, need to give the people a feeling of choice but not give them any sort of real power of structural change, and they split on a strange line, for most of the world, that I have even trouble to describe myself. I think Trump pleases people there because he pretends to be a structure reformist, which sounds fresh.

It's not the people who can't be diverse politically exactly, it's more complex.