It was foolish, and things considered, probably a sign of incompetence that our POTUS ditched the people of Iraq and left without leaving a security force. It is surprising that this handled like it was considering that the U.S. has successfully ameliorated post war situations far more complex than this, Post war Germany for and the occupation of Japan by MacArthur a good examples.
A little post traumatic hand holding has been recommended since Joshua fit the battle of Jericho, (the Jewish soldiers were not allowed back into the Jewish community until they waited about a week after Jericho fell. It was known three thousand years ago that post event decompression and reconciliation is a necessary part of war.
Of course Obama inherited the war, voted against the war while in Congress, and had more of a stake in Bushes war failing than he did in seeing its successful conclusion.