Scott McClellan's Confessional memoir

Scott writes '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 Iraqi citizens dead – he would have never made the decision to invade, despite what he might say or feel he has to say publicly.'

Where in the world has Scott seen a leader governing using a crystal ball that tells him/her the consequences of his/her decision'? Or does Scott believe if the American casuality were to be 2 or 3 and the Iraq casuality 100 or so, the President would have made the decision to inavde and that would be acceptable?

I really don't understand Scott's point.