Does Heightened Security Really Matter After Terrorists Strike?

The conclusion of a recent study has serious repercussions for authorities and citizens. The study, conducted by RAND Corp., suggests that after a terrorist attack in a major city, there is no evidence that another attack will immediately follow there. Even though the report specifically notes that the findings do not imply that increasing security locally after an attack is unwarranted, this is the conclusion many have drawn. It's dangerous to base security policy merely on historical statistics -- especially if one attempts to apply it universally....