Stephen Biddle, who appears (quick Google) to be one of the more reality oriented members of the foreign policy establishment, though he worked on the current “surge” policy with Petraeus, is suggesting that a British from Iraq will be ugly and violent, with Shiite forces attacking them on the way out in order to create bragging rights that they “pushed the British out”?
If what he says is true, and I am not convinced, these people already largely control Basra, and there are very real advantages to facilitating the UK exit, it’s irrelevant, because it will be a factor whenever the troops pull out.
We cannot fix what was broken in Iraq.