What are you going to do if after we invade, we DO find Weapons of Mass Destruction. Are you going to say "thank you Mr Bush for saving us from a terrible threat." Or are you going to continue to whine and make idiotic statements?
I think it's asinine to think we can curtail any sort of technology, and that it is impossible to keep it from spreading, and that it is inevitable that he will either have or get them eventually anyway.
The point is he is not going to use them unless threatened.