The partition of Iraq would have lead to increased ethnic conflicts and civil war which is what all sides in Iraq recognized. Sunch partitions lead to ethnic cleansing and even more hostilities. As Senor says here the partition would have involved expelling Iraqis from their home on a large scale. A bigger wave than the refugee situation before this from ethnic strife as it would now be official. Compare this to the partition of India. Once its official a huge wave of expelling begins and an official kind of ethnic cleansing occurs as hotilities increase and each of these partitioned areas starts to get outside help from neighboring countries and an arms race in the area begins and new fears are aroused. No question things were bad but it its to the credit of all the Iraqi parties and leaders that they had the good sense to act in the right way. As Senor asks what do you do with Kirkuk which is majority Kurdish but has a large Sunni population. Its also to the credit of Bush advisors and General Petraeus that they continued to persevere when things looked very dim. A further inflammation in Iraq would not affect people in Des Moines or Biden's Delaware so when things get really nasty its easy for an expert or politician in the USA or Europe to take some policy action and then leave leaving that region in Asia or Africa to bear the consequences....