Aunty, how much oil do we get from the Middle East? How much do we get from Iraq or Iran? The theory doesn't make much sense when we examine the facts of the situation. Iraq, prior to the invasion, did not represent enough of a strategic asset to the US for us to invade to keep it from the hands of another. It would be akin to us invading Poland in August of 1939 to keep the Nazis from launching their attack.

BTW - we get less than 5% of our oil from Iraq and that is significantly more than we got prior to the invasion.