"The government knows that there are only a few dozen, at most, gangs involved in all this killing. The current deal is for the Sunni Arab community to shut down their thugs, while the government takes out the Shia militias. The government has started carrying out their end of the deal, but the Sunni Arabs have moved more slowly. This is because the Sunni Arab thugs are paranoid, quick on the trigger, and willing to murder prominent Sunni Arabs. The Sunni Arabs fear trapped, caught between their own radicals, and the majority of Iraqis (Kurds and Shia Arabs), who would just as soon see Iraq free of Sunni Arabs. The hatreds go deep, Saddam's decades of brutality against Kurds and Shia Arabs saw to that. While pundits go on about Iranian desires to dominate Iraq, the reality is more about vengeance against Sunni Arabs for past sins. Nothing too complicated, but it's a fire that's very difficult to put out."