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For a while now, I have been writing about our penchant for “movie-plot threats“: terrorist fears based on very specific attack scenarios. Terrorists with crop dusters, terrorists exploding baby carriages in subways, terrorists filling school buses with explosives—these are all movie-plot threats. They’re good for scaring people, but it’s just silly to build national security policy around them.

But if we’re going to worry about unlikely attacks, why can’t they be exciting and innovative ones? If Americans are going to be scared, shouldn’t they be scared of things that are really scary? “Blowing up the Super Bowl” is a movie plot to be sure, but it’s …