It's sad that the person who co-wrote Zero to One would fall into this orbit. It remains one of my favorite business books in spite of the fact that its co-author has gone off and hopped on the crazy train politically.
Of course many of the original Italian Futurists became Fascists too. There seems to be some tendency for unbridled futurist thinkers to fall for fascism and similar ideologies.
Some futurists also go for left-leaning forms of totalitarianism too. I know several really smart authoritarian Marxists.
I see it as a pathology of futurists who have gotten themselves too far from the coal face; of futurists who are not actually Doing The Work (or aren't anymore). There's a temptation to think that politics is the thing holding us back from progress and that progress can be accelerated politically. If we could just get rid of all that slow painful democratic consensus and replace it with some kind of dictatorship of know-it-all smart people all that magic futurist technology would just materialize out of thin air.
There's also this tendency to think regulation is holding us back. That can happen, but it typically happens after things are invented. Regulation is not preventing us from achieving immortality or true AI or free energy because we have no idea how to do those things regardless of whether or not there are laws against them.
Edit: Thiel's case is honestly more mysterious though. Here's a guy who's spent years ranting against the fact that our culture is controlled by know-nothing windbags who don't actually do anything and are hostile to progress and what does he do? He gets behind Donald Trump, a total know-nothing windbag who has absolutely no skills, abilities, or understanding beyond the ability to promote himself and manipulate people. Trump is the emptiest of empty suits. There is literally nothing there except primate dominance gestures. I have no idea what Thiel thought was going to happen, but it's not happening whatever it was.