Thiel has 2 real fears and he's been pretty consistently worrying about them.
His own mortality terrifies him
He's convinced that an apocalyptic end to the USA as we know it is coming any day now.
A proletariat uprising would be apocalyptic in his view AND he would undoubtedly get the Mao special if one happened.
There's 0 chance of one because Americans are way too divided but this killing is the biggest source of existential dread for him and he's probably been waking up with nightmares about it.
His mortality terrifies him because it shouts in his face that he is ultimately no better or different than the poor. The great equalizer comes for us all, and most of us will be forgotten within just a handful of generations as though we never existed at all. That's easier to reconcile with when you already know that you're not special. Peter spent quite a long time believing otherwise. With every passing year, his desperation grows. A decent guy would use his absurd resources to improve life for all, cementing a positive legacy, feeling more fulfilled; he's a quantity over quality kind of guy though. Fewer, happier years are not as attractive to him as maximum, if miserable, lifetime.
So, correct me if I'm wrong... This is one of the dudes actively driving political division to distract the populace from the class warfare being waged on them, no?