"The members of this movement have no sense of moral decency. A nation makes a sacred pledge to pay the money back when it borrows money. But the members of this movement talk blandly of default and are willing to stain their nation’s honor.
The members of this movement have no economic theory worthy of the name. Economists have identified many factors that contribute to economic growth, ranging from the productivity of the work force to the share of private savings that is available for private investment. Tax levels matter, but they are far from the only or even the most important factor.
But to members of this movement, tax levels are everything. Members of this tendency have taken a small piece of economic policy and turned it into a sacred fixation. They are willing to cut education and research to preserve tax expenditures. Manufacturing employment is cratering even as output rises, but members of this movement somehow believe such problems can be addressed so long as they continue to worship their idol."
July 5, 2011
And this is close to the best, concise explanation I have read: