I would argue that the war in Iraq is justified based on Hussein not complying with U.N. sanctions and the fact there were Al Qaeda cells supported by Hussein's regime. Furtheremore, who is to say the massive amounts of military traffic from Iraq to Syria that was detected by satelites was not a mass movement of WMD's. After all the U.N. gave Saddam 6 months notice before any weapons inspectors were sent in. Of course, there is the fact of Hussein's regime mass murdering the Kurds, among many other crimes against humanity.
"All it takes for evil to prevail is for good men to do nothing"