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We went into Iraq to get rid of an evil empire (as a convenience), and we knew we would DRAW the enemy (Al Qaeda) in to us...and it worked.
I don't believe that one little bit. What I think really happened is that we got bad intelligence indicating that they had WMD's and that A.Q. was operating in Iraq. Then, once we got there and realized that our intelligence was wrong, we created the above excuse. Because if it was the real reason they lied to us for a long time when they said they were trying to lock down the borders to stop insurgents from entering the country. In addition, if that was really the plan, it was quite possible the dumbest plan ever devised.