Those of you who have installed old versions of software know that you can find yourself battling bugs that have been addressed in later versions.
The problems in Iraq, the insurgency and the fighting between Shiites and Sunnis, probably have to do with the social dynamics in Iraq. Or, it might have to do with the version of democracy that we've shipped into Baghdad.
Not having used the "establish democracy" function of our version of democracy in centuries, we forgot that our version includes ethnic cleansing: a little bug that the West has tried to design away, with varying levels of success, in subsequent Democracy releases. Sadly, someone in DC forgot to ship the Iraqis one of the newer versions.