Deaths from revenge killings now exceed those from terrorist or anti-government activity. Al Qaeda is beaten, and running for cover. The Sunni Arab groups that financed thousands of attacks against the government and coalition groups, are now battling each other, al Qaeda, and Shia death squads. It's not civil war, for there are no battles or grand strategies at play. It's not ethnic cleansing, yet, although many Sunni Arabs are, and have, fled the country.  What's happening here is payback.