Your wealthy classes and the middle classes are disconnecting as the plutocrats weath increase yet their proportion of the tax burden decreases while more rests on the middle classes.
This is a popular notion, but not true. the top 25% of earners in this country pay 85+ percent of the tax. the bottom 50% pays between 0 and 3% of the tax, and much of what they pay, they get back, some getting back more than they paid in.
It is true that the rich are making more, but that has nothing to do with anything. In this country, it is not true that if someone makes more, someone else makes less. The pool of money is not static.
The biggest problem we have right now is that the economy is stagnant. That has more to do with policies of the government, than with anything to do with business.
The US is not immune to unrest, but if it comes to a civil war now it would not be because some people are making to much money. It would be to preserve our union and our constitution, which the current administration uses as toilet paper.
redistribution to pacify the masses never works. A good economy in which everyone has a shot at doing well, always works.