Nothing, a reader essentially says in response to the question posed by Uri:
It’s weird. EVERYTHING I read on the subject starts with the assumption that SOMETHING has to be done about ISIS, and that WE, America, must at least participate in that something. But why? ISIS is not a threat to the U.S., there’s no real compelling interest for U.S. in preserving the Iraqi regime—or even the Iraqi borders. There are regional actors that have a MUCH greater national interest in resisting or rolling up the Islamic State. Turkey, Saudi, Egypt, and Iran all have powerful militaries, and if they aren’t interested in fighting ISIS, I can see no reason why the U.S. should.
Before we can have any kind of national conversation about WHAT to do about ISIS, we should first arrive at some kind of consensus about WHY we should do anything at all. Yes, they are a particularly bad bunch, but if that’s the basis for deciding who we should go to war against, we’re going to need a much bigger army.
Another reader provides a longer and more detailed response:
Realistically, there are no good options.