After the three-week military campaign that dispatched the regime of Saddam Hussein, the Bush administration may be tempted to unleash American forces against the next fire-snorting dragon down the line, whether in Syria, Iran or North Korea. While President Bush has every right to be pleased by the victory in Iraq, he should not confuse the military achievement for a validation of his doctrine of pre-emptive strikes. We did not like the combative doctrine when it was formally unveiled last September because it seemed to walk away from America's historical inclination to work with other nations to preserve the peace...