Too much of anything is bad, though. That's kind of my concern. Opponents would be making the same arguments if income inequality were half of what it is. Or a quarter. People will always be able to find a justification for why someone else shouldn't have what they do.
The key question is how much is "too much," and more importantly, if the proposed fixes for that are worse than the "problem."
> Large amounts of money and power are interchangeable. Large inequality leads to political instability. Even if people have enough bread and circuses, they may not want to be just observers and see to what direction the wealthy move the society.
I don't think the situation is as clear-cut as this, at least in the US. No matter how wealthy you are, you still have only one vote, and both sides have no shortage or rich benefactors.
> Relative poverty is also a form of poverty.
I don't think it is, though. If someone has 1000x my assets but cannot use them to make his lifestyle notably better than mine, that in no way makes me "relatively impoverished." His additional zeroes in his bank account can only make me feel bad if I choose to feel bad about them (and many do).