Wealthy people pay a lot of taxes in the USA. If they aren't routinely avoiding paying income tax and taxes in general, how could that be the point?

It may be more realistic to view this in terms of elite power struggle. There are some constituencies that have found their way into positions of some power -- in government and public service -- that are in conflict with other elites, who have found some power in private enterprise. These groups battle for control of things. One strategy in the battle is managing the other group's access to money.

It's not clear from any kind of first principles, that we are better off with government allocation of a large portion of the society's capital. That hasn't historically been a big winner. Private ordering seems to net out a higher quality of life overall, even with income inequality.