I don't buy it. Some of them are superrich because they're ruthless psychopaths, so if we admit that being a psychopath means that you're lacking a key component of what makes us human. But as I'm always banging on about here, a lot of us - if I may speak for a lot of us - are living lives of extreme material privilege, walking past homeless people every five minutes (if you're in London), otherwise not coming into contact with poverty (if we can help it), and feel only the vaguest twinges of guilt about it. We certainly aren't rioting in the streets for income equality. The most most of us do is put a Vote Labour sign in our window. Dutifully fill up the recycle bin.
To be selfish, insulated against what threatens your comfort, etc. is - I would suggest - the human norm. (Not precluding compassionate acts, cooperation, etc.)
I'm not trying to excuse the superrich here, and clearly being that rich selects for ruthlessness and egotism in the first place. But I wonder if turning the superrich into the evil ones lets US off the hook..