I think wealth inequality is fine; it's a sign of economic growth, which is naturally uneven. I object to wealth inequality on the order of ten billion times. That's not growth; that's strip mining.
What's worse is, by my divination at least: as a general rule, I don't find these people to be exceptional or necessarily well suited to wield such power. And I would also conjecture that the centralization of power in aspects of individual occurrence and institutions creates a behavioral uniformity, which I hypothesize necessarily leads to considerable instability ultimately creating more "too big to fail" situations which ultimately compromises the health of our polite society. And because of the immense leverage, I don't find it to be stepping out of bounds to say that it's entirely probable that our body politic is owned and operated through backroom auction of policy.
I'd also append that, from my experience, I've never seen debts factored into arguments regarding wealth disparities, but I do suppose it should be. Historically debt peonage was a considerable force. I think it would be interesting to look at the wealth distribution charts and seeing how it plays out when they traipse into the negative.