I would hesitate before judging someone purely on one statistic but it's difficult to imagine how one amasses that sort of money ethically. If I asked you to think of a billionaire that you would leave in charge of children, who would you pick? Bill Gates perhaps, Warren Buffet? It's slim pickings.

Jon Ronson advanced the idea that psychopathy is over-represented in the CEO class and presented some compelling examples in his book, The Psychopath Test.