It was, first and foremost, Saddam's fault, and the fault of his henchmen, for his predations upon his own subjects, his repeated attacks on neigboring countries, his [link|http://www.angelfire.com/ca3/marlowe/iraq.html#terrorism|support for terrorism] and his chronic attempts to acquire and hold on to weapons of mass destruction.
Right?
Right?
(He also repeatedly flouted UN resolutions, in case you think the United Nations deserve any respect. Although, given the way they responded to said flouting, it's fair to say they don't deserve any.)
Secondly, it is the fault of those who opposed to the bitter end any effort to put end to all the above. You know who you are. Accept your personal responsibility. The ghosts of Salman Pak expect no less of you.
It is a credit to the American people that the great majority of us support the global war on terror, including the Iraq campaign.