A long term strategy to stay on the offense in the middle east.
USA has no motive to withdraw from Iraq, and it is not their plan.
They are building superbases in Iraq, and their plan is to stay.
Fomenting instability in Iraq, and overall in the oil-region serves as a self-created excuse to maintain military presence.
This is logic.
Bush U.S. Must Stay In Iraq To Control Oil
“On the one hand we’ve got a plan to make sure we protect you from immediate attack, and on the other hand we’ve got a long-term strategy to deal with these threats, and part of that strategy is to stay on the offense,” Bush continued.