W wanted "righteous revenge" for 9/11 and Cheney wanted profits from military contracts. Those were the most direct interests. (Phantom) WMDs, human rights, and oil were the other oblique excuses. Reaffirmation of the supremacy of American imperialism was another purpose. It lead to $10T of wasted treasure and 500k lives snuffed out for the egos and ambitions of foolish and crooked leaders.