Via Patrick Appel at Andrew Sullivan’s place, defense theorist Thomas P.M. Barnett, or perhaps his colleague Sean Meade (it’s unclear who wrote this, exactly)
“„By sticking it out long enough, despite the high casualties, we simply waited long enough to take advantage of the Salafi jihadists’ natural tendency to go overboard with the locals. Abu Musab Zarqawi’s impatience to turn Iraq into al Qaeda’s global cause celeb led to brutality that eventually alienated Iraq’s Sunni tribes, yielding the “Anbar awakening” that signaled the beginning of General Petraeus’ somewhat successful rollback (or is it buyback?) of al Qaeda’s presence there.