Reply #17: more from that well worth reading article:

[UpInArms]

A bit of history will be useful here. The original case for a progressive income tax -- that is, one levied disproportionately on larger incomes -- was based less on raising revenue for the state than breaking up concentrations of wealth, inherited and otherwise. The nation's Founding Fathers considered these to be undemocratic -- markers of "an aristocratic society, not a free and virtuous republic," as the tax-law expert Dennis Ventry has written.

Recent events validate the Founders' instincts. The craze for financial deregulation in Washington was fomented in part by Wall Street plutocrats brandishing lavish political donations, gifts, offers of employment and other trappings of economic power. Would Wall Street have gotten so far out of control if it had had less power to wield? No one can know for sure, but it's a question worth pondering.

There's also a social value in suppressing income inequality. In a country with only a slightly less ingrained tradition of civility than the United States, the AIG affair would provoke rioting in the streets.