Blame Turkey for arming ISIS.
[This is not to say Turkey is primarily to blame. This sounds like a narrative to blame Turkey for something the US either approved or acceded to.]
And especially this:
In the face of these failures Iraq’s Shia majority is taking comfort from two beliefs that, if true, would mean the present situation is not as dangerous as it looks. They argue that Iraq’s Sunnis have risen in revolt and Isis fighters are only the shock troops or vanguard of an uprising provoked by the anti-Sunni policies and actions of Maliki. Once he is replaced, as is almost certain, Baghdad will offer the Sunnis a new power-sharing agreement with regional autonomy similar to that enjoyed by the Kurds. Then the Sunni tribes, former military officers and Baathists who have allowed Isis to take the lead in the Sunni revolt will turn on their ferocious allies. Despite all signs to the contrary, Shia at all levels are putting faith in this myth, that Isis is weak and can be easily discarded by Sunni moderates once they’ve achieved their goals. One Shia said to me: ‘I wonder if Isis really exists.’
Unfortunately, Isis not only exists but is an efficient and ruthless organisation that has no intention of waiting for its Sunni allies to betray it. In Mosul it demanded that all opposition fighters swear allegiance to the Caliphate or give up their weapons. In late June and early July they detained between 15 to 20 former officers from Saddam Hussein’s time, including two generals. Groups that had put up pictures of Saddam were told to take them down or face the consequences. ‘It doesn’t seem likely,’ Aymenn al-Tamimi, an expert on jihadists, said, ‘that the rest of the Sunni military opposition will be able to turn against Isis successfully. If they do, they will have to act as quickly as possible before Isis gets too strong.’
It would be a really good time to cut a deal with Putin, Assad, Abbas, and Rouhani, and get back to the business of repressing the really dangerous people in that part of the world. Too bad we don’t have a Congress intelligent enough to see this.