The Boston Marathon bombing is just one example. The head of the NSA, Gen. Alexander, has played up his agency‘s extraordinary hindsight, which allowed it to rule out the chance of another bombing. This occurred at roughly the same time that the only surviving perp was being taken into custody. Plaudits and such but one would think tapping the backbone of damn near everything would result in more prevention, which Americans would unanimously agree to be the preferable to crystal clear hindsight.