Thiel supported Trump and built an escape plan. It's not that he doesn't have a skin in the game, but if the game turns bad, he can bail and leave "us" behind.
I see where you're coming from. But I won't weigh someone's politics when determining if they are a good American or not. Politics are too complex to interpret good and bad, but giving money to tech ventures is decidedly good for our economy.
Your argument is bad for two reasons. One, being 'up to the task' is subjective. Two, nobody but Peter Thiel knows why he got the citizenship. My argument is good because I argue 'If you invest in tech, you help the economy, and that is good' which has no assumptions or opinions in it.