He is a lot more rational than Bin Laden, and is not a religious fanatic. If if Sadaam Hussein was really that irrational, he would have used weapons against us already, especially during the Persian Gulf War. He is waiting for the right time, which would be one that would give this usage of weapons against the U.S., the most legitimacy. In a weird way, Hussein's whole life has been a strive for some sort of legitimacy.
"Or sell as many WMD to Terrorists and hope they make it to our shore's. Don't Worry about this Iraq thing. It's in good hands...."
A huge problem with U.S. foreign policy has been that we too often firmly define our national interests after we already act.