After recent events in Barcelona, Orlando, Paris, Las Vegas and other places, the prospect of a lone wolf or organized attack with severe consequence seems more and more plausible. I am certain any right-minded person would stop a terror attack if it was within their ability. But that is the question: “Do you have the ability?” The first thing you have to consider is that you may be killed. Many terrorists, unlike common killers, are on a hell-bound trip. Holding a gun on them or threatening them will be meaningless.