Bomb the hell out of the Syrians? Surely they have suffered enough.
Iraq III? Maybe this time.... maybe....
Send the ground troops into Saudi? Quatar?
Acknowledging that some of ISIS / Al-Qaeda gripes do have some merit, stop interfering in other countries affairs, stop propping up dictators because they are "our" dictator.
Something else?
Unfortunately for the Syrians, my money is on bomb the hell out of them, trying to limit the number of "collataral damage" of dead women and kids, but hey, not our fault.
And so we go round the merry go round again.
Though fusion is a long way out, hypothetically, if we didn't have any reason to interfere and could just leave the Middle East to figure out its own problems, they wouldn't have a reason to see us as the enemy.