If anyone, specifically Obama was concerned, he would attack the root.
That is why it makes more sense that IF we are going to waste resources and break things it makes more sense to take out the root problems; Iran, Saudiland and Syria. That would clean up the proxies.
As soon as Iran has a nuclear weapon, they will indiscriminately use it on Israel, Europe and America..... and not necessarily in that order.
Global security and stability rests on this action.
My position on Iran remains where it has been.
Israel will strike Iran before they have nuclear weapons. We should provide them any material support they need in terms of bombs and aircraft, and if necessary, offshore artillery strikes to hobble a retaliation.