What about rendering him unconscious, injecting some whisky in his blood, spilling some more whisky into a car, leave the bottle on the co-pilot seat and then sitting him on the driver car and crashing (I'm talking about a remote controlled car, of course, no need to hurt anyone else) on a bridge pilar while running 250 Km/h? I mean, it's too good compared to what those people deserve, but perhaps, yihadist wannabes might think twice before following someone who doesn't even meet the standards for an average muslim (Hey, he called himself a yihaddist and yet he died because he crashed while driving heavily drunk what kind of muslim is that )