Those are extremists that believe their religion is above everybody else and they will kill and die for their god. Reasoning with them is not applicable anymore. They are already willing to die for their religion, and they'll do anything to prove it. The only way to even get close to stopping them is eliminating them. But there will always be terrorism in the world. As long as there's ignorance, there will be terrorism. As long as there's humans on earth, there will be ignorance.