Throw in the fact that the bulk of the world’s oil supply comes from that area and the geopolitical situation becomes even more complex.
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This is actually a pretty good situation for the US. Cooperation/assent with Iran concerning Iraq helps warm the current nuclear negotiations while at the same time stretching Iran's sanctioned resources (already in Syria and Lebanon) even thinner, and increasing hostility to Iran with all the Sunni regimes. Plus the US doesn't have to spend any money or get blamed for any of the fallout (other than the initial invasion, of course). It's a strategy worthy of British foreign policy, at least before Tony Blair came along.
Of course we also have political opportunists blaming everything on the President. Even this stunning little bit of drivel from Dick Cheney's memory hole.
It's a compelling case for the US to participate in the International Criminal Court.