I have a historical comparison:
Again, I agree with you that Saddam is a despicable and evil man, but the world is full of such leaders. Do you suggest we go around the world and effect regime change wherever we, the US, the epitome of morality, find someone who we deem unfitting to lead a country. What gives us the right apart from our might. We have faired horribly in the past (just look at Afghanistan its worse and more corrupt than it was before we invaded just about everywhere but the capital).
Rome, in the waning days of its Republic, defeated Carthage, its longtime rival for Mediterranean control. With the Carthaginean fleet out of commission, piracy multiplied on the high seas. This threatened the grain shipments that fed the Roman populace.
So the Roman Senate gave General Pompey a massive amount of money, troops, and ships - with the proviso that he destroy the pirates. He was permitted to invade and destroy land bases up to 50 miles from the shore.
This was the beginning of the Roman Empire. It was a hard time to be a pirate, or a barbarian, but it was the grandest civilization in Europe until recently. Their might did not give them the right, but they had the right to use their might in their own defense.
Similarly, today, after the collapse of the Soviet bloc, hundreds of little terrorist organizations suddenly have almost free reign over large swaths of territory. They threaten the oil shipments that are just as vital to our way of life as the grain was to ancient Rome. What we need is a modern day Pompey, to lead our armies to victory over the pirates of today's world. Our might does not give us the right to destroy countries, but we have the right to use our might in our own defense.
Also, somebody said that Afghanistan is worse now than ever before. That is only partially true, and only because peacenik do-gooders who are too scared to risk their own political careers for the sake of world stability want to keep the peacekeepers in Kabul, and not let them do their job. These same bastards left the UN troops helpless observers in Rwanda.
CZAR