Saddam violated all 17 points of the cease fire from 1991 Persian Gulf War. That should have been enough to depose this guy, but not for liberals who hate America. He also violated his agreements on weapons inspectors and UN oversight over his oil for palace program.
BINGO! That should have been all there was to it! Game over! And he was attacking the USA during this period by firing upon both British and American planes patrolling the No-Fly Zones.