Isn't Trump just a symptom? What scares the shit out of me, isn't Trump. It's that Americans voted for him once, and a repeat of that shit show is somehow again a possibility. Even 5% thinking that could be a good idea, would be cause for concern. 10% is "what the actual fuck America...".
Remove Trump from the picture, and the issue is still there. The people who would vote for him, and the machinery in place that can convince them of it.
Imagine someone as vile as Trump, but not dumb as a sponge....
Lead poisoning has been my working theory to explain the last 50 years.