Uh, that would be because he flattened the World Trade Center and smashed a jet airliner into the Pentagon on the morning of 9/11/01.
Actually, Sadams not the suicidal type. Just like Allah, he has others do his fighting for him. Al Queda suicide terrorists flew the planes. Saddam was probably in his bunker or in one of his Palaces watching it live on CNN. Noone suspected Saddams involvement early on. Word was slowly leaked down from the top, I suspect.