The war in Iraq, and against Terrorism, is as justified as the Declaration of War against Japan on December 8th, 1941. We were attacked, on American soil, by Islamic Fundementalists who's only intention was to end American lives in a fit of rage, for no reason other than we are, and always have been, a Christian nation. Thousands of Americans perished in the assaults that day, the worst attack on American civilians in the history of America. When the attack on Americans happened on December 7th, 1941, we went to war to punish the agressors, and we have done so with the war on Terrorism.
We are fighting it in the wrong way, as Gawain said. We still support Terrorists in the Balkans, who fight against the government of Serbia, who could have aided us in fighting Terrorism in the balkans. We still support the Pakistani and Saudi Governments, who harbor and support Terrorists. We haven't questioned France on how they allowed Osama Bin Laden to get his kidney transplant there. Nor have we helped Russia deal with the terrorist stronghold of Chechnya, or the Indonesian government deal with the terrorism there. We haven't taken out Syria, who have opressed the Lebonese people and harbor Terrorists and Insurgents. Nor have we devoted enough men to our commitments in Iraq and Afghanistan.
While I disagree with the way the war is being carried out (our new military strategy that does not call for Total War [no pun intended] is obviously a massive failure), I do support it's cause and I do beleive it was the right response to the murder of thousands of Americans on September 11th. Too bad the Clinton Administration didn't have the courage to deal with it after the Embassy Bombings and the attack on the USS Cole.