ALTHOUGH financial reporters have started to realize that Mr. Bush is out of control — he has "lost his marbles," says CBS Market Watch — the sheer banana-republic irresponsibility of his tax cut plans hasn't been widely appreciated. That $674 billion tax cut you've heard about literally isn't the half of it. Even according to its own lowball estimates, the administration wants $1.5 trillion in tax cuts over the next decade — more than it pushed through in 2001. The administration has used gimmicks to postpone most of the cost of these tax cuts until after 2008...even so they suggest a fiscal disaster once the baby boomers start collecting benefits from Social Security and Medicare.... Paul Krugman