For starters: 1. Because they have gone to war with us. The evidence will be laid out by Bush when it is to our maximum strategic advantage.
2. They have shown themselves ready, willing and able to employ weapons of mass destruction against their own people and in the war with Iran.
3. They pursue a program of developing weapons of mass destruction (nuclear, biological, and chemical) and the means to deliver them widely.
4. They have used international terrorism as a means of implementing policy. It is highly likely they were the sponsor of the original WTC bombing.
5. They have and continue to threaten the orderly production of petroleum on the Arabian peninsula, which jeapordizes the world economy.