Statistics have shown for a while now that psychopaths or sociopaths are drawn to positions of power and are therefor overrepresented in those positions.
On the other hand, excessive power (== money) often brings the worst out of us, as power appeals to our (sick/immature) need to dominate those around us (on a personal or even global scale). Domination can act like a drug. And once the brain is hooked on that drug, it's hard to go clean again.
Excessive power (== money) takes a lot of maturity to be handled ethically. Obviously, a lot of people fail hard.
Which is why our society should fight any type of inequality until it's completely gone.
I don't think this actually follows from the prior premises you put forth. If I'm the 10x programmer, do I need to have my performance handicapped because some psychopaths exist somewhere in the world? That's a kind of inequality which I would argue isn't relevant.
I have friend who is an employment lawyer. When I first asked her what she does she said "I keep old white men out of trouble". How sad.
Edit fixed typo