How to Destroy a City in Five Minutes

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You don’t need a weapon of mass destruction to ruin a city.

Well, maybe sometimes you do. You’re not getting rid of New York City without one. But some of the world’s cities are so vulnerable, so precariously perched above an abyss, that a single bloodthirsty nutjob with a rifle can bring it to its knees in a matter of minutes.

Look at Tunisia’s resort city of Sousse on the Mediterranean. Two months ago, an ISIS-inspired nutcase named Seifeddine Rezgui strolled up the beach with a Kalashnikov...