smaller inequality is good for the economy, that is definately a fact, but most people are divided on how to make such a gap smaller.
We have many ways to do such a thing. People suggest taxing rich higher than the less wealthy, but then those on the other side for some reason believe that is unfair. Some suggests a flat tax, which will not work. It will overburden those who are less weathy and/or decrease revenue.
Basically, its class warfare and it is very difficult to end in either side's victory.