Americans love to second-guess themselves. It has become a national sport since Vietnam. But it is dangerous business when we have so many Monday-morning quarterbacks in wartime. Two years after our dramatically successful invasion of Iraq, leading to the liberation of 26 million Arabs and Kurds, the second-guessing is at all time highs. They ask: Where are the weapons of mass destruction? Where are the connections between the regime of Saddam Hussein and the al-Qaida terrorists who attacked the United States on Sept. 11, 2001? Where was the threat Iraq posed to America? May I remind the second-guessers that no...