Thiel is a Republican and a horrible human being. Scientists have indicated for some time that it is just luck.
It's luck if you are born with the right genes. It's luck if you were born with rich parents. His parents were definitely at least upper middle class, and he attended private schools.
That he got caught up in Libertarianism and was impressed by Ayn Rand makes him an idiot. I read all her books between the ages of 18 and 25, and her heroes are all psychopaths. The only people who could relate to those heroes had to be of the same persuasion.