One of the reasons that ISIS is gaining recruits and followers is the optics of power and control. Their gruesome displays of brutality shock the observer and command fear and compliance. The disgusting exhibitions of beheadings, drownings in cages, and public torture are standard fare for the Islamic terrorists, and they are meant to prevent any and all push back from conquered peoples.
The idea of water boarding and making terrorists stay in chilled rooms or other previous Western techniques for interrogation seem quite tame compared to the barbarous activities of the jihadis, and perhaps what they need is a bit more of their own medicine. A sniper from the elite British Special Air Service (S.A.S.) unintentionally did just that to a terrorist commander who was training his charges in the fine Islamic art of beheading their victims. The video on page 2 shows how one bullet could actually decapitate a person.
Watch the amazing video on page 2: