Right, inequality isn't inherently a bad thing, its when it get so extreme that it impedes class mobility and shrinks the middle class. We have to strike a really careful of regulations and freedom to create a desirable society.
With regard to class mobility, can we say at what level it gets too extreme or conversely at what level it is just perfect? A country such as Albania has a lower Gini coefficient than the US but is much, much poorer, but as such has less income inequality. I don’t believe that social mobility is much better there (I happen to have a good friend that lives in Tirana).