And this is where the only parrallel to vietnam might be raised:
we step in, to clean up a mess that is a direct result of our fellow nations pulling out of something that was too messy and hard for them to deal with.
It certainly looks like there ought to be three states, Kurd, Shia and Sunni, build a fence or something. but of course that is way too simplistic.
But as evidenced in palestine and lebanon, until the arab world stops educating (with lies) their kids to hate Jews and the west to the point of murder, the mass of angry muslims will not go away. the blame there lies in the laps of arab leaders.
Conservative opponents of the war say that only totaltiarian/authoritarian governments can keep peace in that religion. The record shows that they don't, excepting Turkey, and even Turkey cannot suppress a Kurdish guerilla movement. Nasser threw away his opportunities largely because he would not make peace with Israel.