Arianna Huffington nails it as far as I'm concerned:

Boys, boys, you're all right. Sure, it's Daddy, oil, and imperialism, not to mention a messianic sense of righteous purpose, a deep-seated contempt for the peace movement, and, to be fair, the irrefutable fact that the world would be a better place without Saddam Hussein. But there's also an overarching mentality feeding the administration's collective delusions, and it can be found by looking to corporate America's bottom line. The dots leading from Wall Street to the West Wing situation room are the ones that need connecting. There's money to be made in post-war Iraq, and the sooner we get the pesky war over with, the sooner we (by which I mean George Bush's corporate cronies) can start making it. The nugget of truth that former Bush economic guru Lawrence Lindsey let slip last fall shortly before he was shoved out the oval office door says it all. Momentarily forgetting that he was talking to the press and not his buddies in the White House, he admitted: "The successful prosecution of the war would be good for the economy."

This is the key to Bush-think. No matter how much criticism they are receiving now, if they successfully prosecute the upcoming invasion they believe that all will be forgiven and they can continue on, business as usual. They have already gone beyond the point of no return in this strategy. The invasion must proceed if there is to be any hope that they can put the Iraq matter behind them. The fact that they could be creating a situation of chaos that could take years to settle down is ultimately unimportant to these people. What they care about is what the immediate image will be right after the fall of Saddam. If it looks good on TV, then they will consider their actions leading up to that point to have been justified. The sad thing is, given our current media market, they are probably right. Which is why it needs to be made clear, now, before the invasion, that an attack on Iraq is the wrong action at this time regardless of the initial outcome. We need to make it clear that flushing Saddam out is not sufficient cause for declaring victory and then going home. We need to hold their feet to the fire even more after their grand and glorious victory. They key to the future belongs to whomever gets to define what "victory" means.