Back up either you are with us or the terrorists canard, which could be done dipolmatically or worst case with air power.
If we don't, we're going to end up with another Islamic state, though their potential as a threat would be delayed by decades.
The most beneficial action would be shutting up the whiners who give encouragement to our enemies, tough to do, but there's no reason you can't call a spade a spade.