Once you assasinate saddam then his son would just take his place and nothing would actually change. You don't get rid of a regime that cemented itself for over 2 decades in iraq by killing their head honcho. It would be similar to when stalin died and then krushchev taking over while making adjustments to stalin's system but not a major overhaul.
bella! Horrida bella!
War! Horrid war!
There are no warlike people, just warlike leaders