The Boston Marathon bombing was not another 9/11. Not close. The order of magnitude speaks for itself: three dead in Boston, nearly 3,000 in New York City. Still, in the aftermath of the Boston tragedy with what now appear to be links to conflicts half a world away in the Caucasus, it is impossible not to ask the same questions that came on the heels of 9/11: just how safe are we in our homes, in our workplaces, on our streets, and at our celebrations? Why on earth would the United States be targeted so often by so many people with so many grievances—why do “they” hate us? And given the destructive power now available to almost any lunatic, just how safe can we be?