What if a billionaire is unskilled in using their money to their full advantage to help people? Or what if the billionaire is ignorant? Would that make him evil? It sounds to me like you're equating them being inconvenient administrators of power to them being evil.
Then it is a grave failure of our system that such a person should be the sole beneficiary of such massive wealth. I think in the same vane that 'ignorance of the law is not a defense", that being really bad of using vast power can be viewed as indistinguishable from evil.
That's a valid viewpoint. Ignorance and all other vices ellicit compassion in me, though I don't have infinite patience by any stretch of imagination, so I have a discrepancy between principle and practice, I guess.
