The thing is though, it doesn't actually serve anybody's interest to remove ISIS because as long as they're there we can, to paraphrase Tony Montana, just point the finger and say those are the bad guys. If they're gone, then we have to worry about how to re-establish law and order while respecting the rights of ethnic minorities while preventing another round of sectarian conflict and all the rest. And really, that's just too complicated to deal with, especially since nobody really gives a shit about the people there and spending all this time trying to sort out their problems is not something anyone wants to be doing. Easier just to keep ISIS around, do a couple airstrikes, torture some folks, project strength, get everyone waving the flag at home, good times for all.