At some point , we may have to let the Shia and Sunnis fight it out on their own, while American troops watch from a safe distance.
Maybe then they will get it out of their system.
We can't undo 1200 years of Sunni-Shiite hatred in 3 months.
True.
In fact, islam, being a religion of hate, has no mechanism for forgiveness or removal of hatred. It only knows rage and revenge.