To those who earnestly ask of Obama's foreign policy why Iraq? but not Syria? or any other world hotspot? I would point back to some personal thoughts from three years ago, in "The Obama UnDoctrine":
Obama is the near textbook embodiment of complex policies that meet the needs of reality and the moment, rather than what the body politic and the commentariat so often pine for, which is abundant simplicity and tidy slogans....
Obama's UnDoctrine is a universe away from the uniform simplicity of Wilsonian or Bushian idealism, which is better left to German philosophers than foreign policies. Idealism is a word closely aligned with ideology, and for good reason: It is a straitjacketing term that, once out of the bag and affixed to its proponent, too often coerces that proponent into grossly ill-advised actions for consistency's sake.
There. Now I don't have to say it again.