Why Bush Invaded Iraq

From the mouth of the former White House Press Secretary, Scott McClellan:

In Iraq, McClellan added, Bush saw "his opportunity to create a legacy of greatness," something McClellan said Bush has said he believes is only available to wartime presidents.

The president's real motivation for the war, he said, was to transform the Middle East to ensure an enduring peace in the region. But the White House effort to sell the war as necessary due to the stated threat posed by Saddam Hussein was needed because "Bush and his advisers knew that the American people would almost certainly not support a war launched primarily for the ambitions purpose of transforming the Middle East," McClellan wrote.
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"I know the president pretty well. I believe that, if he had been given a crystal ball in which he could have foreseen the costs of war — more than 4,000 American troops killed, 30,000 injured and tens of thousands of innocent Iraqis dead — he would never have made the decision to invade, despite what he might say or feel he has to say publicly today," McClellan wrote.