"And as to our backing Saddam many years ago, yes that's right. Why? Because our relations with Iran happened to be piss poor at the time. Why? Because they held lots of fine American folks as hostage and Jimmy Carter couldn't figure out a way to "talk" them into freedom. So yes, we crawled into bed with Saddam. Why? It suited our interest at the time to do so. Rocket science, right?"

If you can't see why that is a problem, then I'm not sure what to say...

As others have said, the Iraqi government is not an islamic fundamentalist one. Some of the peoples in his country (eg the Kurds and the Shia muslims) are more fundamentalist than them. Since Islamic fundamentalism is evil, is Saddam justified in attacking them and and trying to stamp out this "evil"? Iran is also actively seeking nuclear weapons, and is a fundamentalist regime. Why aren't we attacking him first?