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Rather than the U.S. troop presence preventing insurgency, it is clear that the insurgency would be much reduced if U.S. troops were to withdraw. For example, we know that today many insurgents draw heavily on religious motivation. But consider that the Association of Muslim Scholars, the leading Sunni religious group, with ties to the resistance, has declared that if a date were set for withdrawal it would issue a fatwa against anyone continuing an insurgency.18 Thus, if the occupation were ended, the insurgency would be significantly undercut.
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and then the rest at
http://www.dsausa.org/LatestNews/2005/The%20Anti-War%20Movement%20and%20Iraq.htm