LOL, it's getting hard to tell if this question is facetious or sincere anymore.
What did Saddam have to gain by gassing 41 villages of Kurds? What did North Korea have to gain by threatening the US with nuclear attack last week? What did Jeffrey Dahmer have to gain by eating his victims? What did the Janet Reno have to gain by barbecuing 88 people in Waco? What did Lon Horiuchi have to gain by murdering Ms. Weaver while she was holding her infant? What did Hitler have to gain by the Holocaust?
Evil is as evil does. If you need to justify it or understand the evil in your own mind, try this: if Saddam is the man who single-handedly succeeds where numerous invasions (featuring surprise and superior numbers), thousands of attacks, hundreds of bombings, and dozens of terrorist organizations failed, he will become a heroic figure, almost even mythic, as honored as Muhammad himself... this certainly falls in line with Saddam's incredible ego (ever see photos from Baghdad where his image isn't visible?), as well as the Middle East's thirst for large-scale death of innocents where "the Israel issue" is involved... just check out their reactions to the 9-11 announcements. Is that good enough for you?