Wealth is not a finite pile of cash from which we all draw. Wealth can be created or destroyed. Differences in wealth mean little, especially when America's poor are considered rich in other nations. Great differences in wealth are the result of a free society. The alternative is everyone being equally poor, except of course for the central planners!
I'll take freedom every time because I can set aside childish feelings of jealousy towards those with more wealth.
No, dude... the concentration of wealth into the hands of fewer and fewer individuals in The USA is the result of paid for favoritism via a complicated pile of democrat inspired and republican perfected bullshit commonly referred to as US Tax Law.
With a fair and simple tax code and a law requiring public budgets be balanced, the distribution of wealth graph would resemble a smooth bell curve, with most of the wealth in the hands of most of the people and plenty of capital in the hands of the majority of the most industrious.