Right! How predictable did you say Iraq has been seen the US invasion?
Perhaps best to leave the internal debate up to the Iraqis and just ... leave. See the complete southern part of Iraq where the coalition forces have dealt with the local Iraqis and transferred power to a local administration.

See also recent chart of war casualties set out in a timeline.  The US forces attract violence like bees collect nectar.

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'Sapere aude'