The tendency to treat Trump as inherently illegitimate and to ignore the voters behind him is just the kind of condition that might lead to future horrors. You might argue (though I wouldn't) that Trump's silliness is also such a leading indicator.
But so what? In a democracy both sides get their chance to push pull.
Case(s) in point: the FCC, FDA, minimum wage laws, Federal involvement in education.
None of those is Constitutional without some laughable legal gymnastics around inter-State commerce, and yet very few people have been complaining about their existence over the years.
As a non-American observer, the whole system seems reminiscent of ancient Rome at the point where it had become an Empire but was still pretending it was a Republic.
Take Obamacare as an example. Leaving aside the issue of whether socialised healthcare is a good idea, Obama had to circumvent the law by instructing the IRS to collect revenues via an executive order.
Is that really a precedent that should have been set? Even socialists should have been a little uneasy at the disregard for the Constitution there, but instead, the ends won out over the means, and it went ahead.
If we're going to sit around waiting for the guy to commit genocide and start a world war before we take the threat seriously, it will be far too late to do anything about it. We need to look for leading indicators.