In the wake of any terror attack, people are left feeling frightened, shaken and vulnerable. And of course that’s totally understandable. But one can take heart knowing that for every terrorist who succeeds in pulling off their dastardly act of violence, there are a whole lot more who fail, either thanks to a government’s efforts to foil them, because of their own bungling incompetence, or sometimes, they fail through simple “bad luck,” which of course means good luck for the rest of us. And you know what? Terrorists have been failing like chumps for a long time.