I can say: from the way he runs his business, he seems like a psychopath. (That's not hard proof, but more than "a shred of evidence.") I can only make a superficial impression, because that's all I see: his actions, not his psychological state. But his appeal to a chicken-hawk is also based seeming like a sociopath. So perhaps I should replace "chicken-hawks seek young sociopaths in order to live vicariously through them" with "chicken-hawks seek young people who seem like sociopaths in order to live vicariously through them", but I thought it was already implied that an investor-level chicken-hawk is not qualified to diagnose psychopathy per se and therefore is, quite obviously, making such determinations based on impressions rather than (illegible, at that level) facts of psychological state. I thought that this was so obvious that I didn't have to say it.
My assertions about the motivations for funding him are not directed at "specific people" since I have not named specific backers, and have neither the intention nor the requisite fine-grained knowledge to do so. However, as a general explanation for why people like him get funded, chicken-hawking is very often correct. I know it, you know it, and as long as I'm not calling out investors by name and saying "I'm 100% sure that this is what's happening in this exact case", I don't see any harm in drawing attention to the fact that it exists and is pervasive, and that, while I don't have the fine-grained knowledge that would be required to call out specific investors by name, I can be over 99.99% sure that it was a dominant contributor to his rise in Silicon Valley.