1. Take their arguments away from them. Stop invading countries trying to bring democracy, ultimately making things worse. Stop torturing and so on.<p>2. Take their people away from them. Like other forms of extremists, they need young male identiy-seeking misfits, who have nothing going on for them and want easy answers, somebody who gives them orders and to be part of something bigger.<p>3. Prosecute them like other criminals, too (with police forces).