I wouldn't give them the credit for being competent enough, but some of their erstwhile Baathist cronies, yes.
Well, that's an interesting theory. However, I think they were just dumbasses who wanted to kill a good person for no other reason than to just kill her. As for the UN mess with oil-for-food, I think our congressional reps. investigating in the house and senate are due to drop a BIG bomb on Koffi and his minions very shortly. One can hope.