“I used to wonder how on earth nazis and communists and the like were able to seize power and control of a population, and now I've seen it”

That’s how the US has worked for a long time. See the war on drugs and mass incarceration, laws against black people and extreme political polarization. There was always a group of “others” that people wanted to get punished.

I bet if Trump had been a little smarter he would have got away with a lot more while people cheering him on. But it seems a lot of political institutions are eroding so maybe the next strongman will be able to go way further.