The ISIS is receiving American weapons from the Saudis in Syria, and using them to kill the Christians (Assyrians / Chaldeans) and Yazidis in Kirkuk and Mosul. Great work USA!
It's fair to state that the people in the USA are not in the same state of mind they were in with Vietnam. There, many believed we were in it wrongly. They supported our getting out, regardless of whether South Vietnam then collapsed. Which of course it did.
Nobody I know, left or right, has been in favor of such a departure from Afghanistan or Iraq. Nobody I know supports the choices in use or non-use of military action by Obama. Probably the reason is that while it seems to not make any sense, it actually makes no sense.
If it isn't obvious, Obama is more or less covertly supporting Muslim constituencies as opposed to Christian, in regions where the US has vested interests. D'Souza argued that Obama was philosophically more of an anti-colonialist than Muslim, effectively anti-American. I think that's true but would add "confused anti-colonialist".