The relatively high income of the most wealthy isn't the problem unless your primary motivation is spiteful envy of the wealthy. The real problems are that it's harder than it was in the past to maintain a middle class lifestyle. The necessities of such a lifestyle have only gone up in price: health insurance, college education, real estate/rent, and maintaining a vehicle. This causes debt to pile up and drives people into depression or serious stress.

In turn, fewer people in this class are investing in the future or hold stock, which means they feel little investment in the world. Instead of feeling like part-owners of the country, they feel like wage slaves with little power to escape the bondage of debt.

On top of this, it feels like just barely getting by with these things requires more time and effort than it used to. People are working more part-time jobs and both parents of a family need to work.

Taxing rich people does little to make these very real problems go away.