They haven't changed.
Saddam violated more than a dozen UN resolutions. They fired at our planes. They were building nuclear weapons. They had used WMD. They were a threat to American security.
There has been ample proof of that in the Saddam documents.
The fact that you clearly know nothing about what was going on before, or what has gone on since we invaded and successfully deposed Saddam is something I wouldn't advertise if I were you.
Maybe you should stop posting before you look any more MSM brainwashed than you already do.
Well, here's a link to the Address to the Nation Bush gave at the beginning of the war:
http://www.whitehouse.gov/news/releases/2003/03/20030319-17.html
The rationale is buried down near the bottom, "The people of the United States and our friends and allies will not live at the mercy of an outlaw regime that threatens the peace with weapons of mass murder.".