So. To keep score. The United States is supporting: the Shia government, which funnels money and arms to Shia militias, death squads, and insurgent/terrorist groups; the Sunni opposition, which funnels money and arms to the Sunni insurgency; the Sunni insurgency directly, so that they will combat the Shia militias as well as al-Qaeda in Iraq, a group of Sunni terrorists supposedly supported by Shia Iran; the Saudis, who fund Sunni insurgents as well–almost surely–as Sunni terrorist groups; the Iraqi Kurds, who have their sights set on an independent nation that includes a de-Arabized Kirkuk; and the Turks, who have their sights set on never, ever seeing an independent Kurdish entity anywhere, anyhow, anyway, ever, amen.
Ah, well, what are you gonna do? Those people in the Middle East aren't going to be killing themselves! Well, maybe, but it's all a lot more efficient when the U.S. gets involved.