Now a first post in this situation is reprehensible...but I am reminded of the tradgedy of the commons because I'm about to utter my reason for doing so..."If I didn't do it...someone else would have"
The nut of it is that the Iraqi regime is accused by the Iranian regime of oppressing followers of the S'hiah sect of the faith of Islam. (And they really are.) According to the strict interpretation of the Holy Q'uran, this makes the Iraqi regime non-beleivers and subject to jihad. Their differences were put on the back burner as long as they could unite against a common enemy. The "great satan" of the United States, and of course, Isreal.
Not being able to do much about the United States, or Isreal, it appears that their patience has worn thin and they're going to go at each others throat.
Which should be the spark that sets off the impending Iranian Revolution, inviting Saddam to attack, giving Bush uncontrovertable justification, inciting the Arab world, and we're all finally going up in one big blast.