Right now, the United States is not engaged in a war with the ISIS. So they are neither winning, nor losing. It is the Syrian regime forces, Russians, Kurds (PKK / YPG / Yazidis), Hezbollah, the Iranian Revolutionary Guard Corps (IRGC), and the Shiite militias which are fighting the ISIS. The Americans don't have any role here.
If the terrorists changed our way of living, they are winning. It cost us billions of dollars when we spend time going through all sorts of securities. That is a waste of money, which can be used effectively to improve our lives.