Freedom is on the march
And this morning's Guardian has an article featuring a "commander" of a Shiite militia (the Madhi Army) which earns great profit kidnapping and slaughtering Sunnis (even if their families pay ransom). The commander and his comrades "describe an intimate relationship with Iraqi security services, especially the commandos of the Iraqi interior ministry." They frequently go on their kidnapping and murder missions with security forces along for the ride, subordinate to the militia commanders.
So the best case scenario in Iraq -- what we achieve in the extremely unlikely circumstance that we accomplish our current, stated goals -- is to strengthen a government dominated by Shiite death squads and/or Iran.