Further isolation of Iran is not in the best interest of the US. They are one of the more progressive and stable countries in the region. Isolation will send the wrong message to a country that has lived up to it's side of the nuclear agreement with the US and just reelected a progressive president. Remember that Saudi Arabia is Sunni, as is Al Queda and ISIS. Iran is mostly Shia. The Sunni's want to dominate the region and have been pushing this anti Iran agenda. Let's be smart for once and stay out of it.