As with dumb criminals, our best hope is dumb suicide bombers. Remember the car bomb guys in Israel who had their clock set wrong, so the bomb went off as they were driving it to the target?
I don't remember that one. Anytime these guys are taken out of action without hurting the good guys is really good fortune. In general, I would rather they get caught, like that woman bomber in Jordan. She provided a lot of good intel it would seem from some early reports.