It's not even necessarily the way they acquire their wealth initially. Zuck gets lucky, codes a MySpace knock-off that just happens to catch on, and becomes a multi-billionaire. Ok, well, in that chain of events he hasn't exactly murdered children or anything heinous. Yes, he was demonstrably "not a great guy" even in the beginning, but loads of awful people win the lottery to0, that's the nature of a probabilistic universe. So it goes. But it's how these billionaires act ...