Lower tax rates have led to higher tax revenues many times, both before and since Keynes' statement -- the Kennedy tax cuts in the 1960s, the Reagan tax cuts in the 1980s, and the recent Bush tax cuts that have led to record high tax revenues this April.

Budget deficits have often resulted from runaway spending but seldom from reduced tax rates.

Those on the other side may have different arguments. However, the question here is not why the left has different arguments, but why there is such anger.

Often it is an exercise in futility even to seek to find a principle behind the anger. For example, the left's obsession with the high incomes of corporate executives never seems to extend to equally high -- or higher -- incomes of professional athletes, entertainers, or best-selling authors like Danielle Steel.

If the reason for the anger is a feeling that corporate CEOs are overpaid for their contributions, then there should be even more anger at people who get even more money for doing absolutely nothing, because they have inherited fortunes.

Yet how often has the left gotten worked up into high dudgeon over those who inherited the Rockefeller, Roosevelt or Kennedy fortunes? Even spoiled heirs like Paris Hilton don't really seem to set them off.

If it is hard to find a principle behind what angers the left, it is not equally hard to find an attitude.

Their greatest anger seems to be directed at people and things that thwart or undermine the social vision of the left, the political melodrama starring the left as saviors of the poor, the environment, and other busybody tasks that they have taken on.

It seems to be the threat to their egos that they hate. And nothing is more of a threat to their desire to run other people's lives than the free market and its defenders.