Over the last week, FBI Director James Comey has done serious damage to his credibility as the nation’s top crime-fighter. To repeat an old saw, he has figuratively shot himself in both feet, with two ill-considered speeches on the so-called post-Ferguson world where police hold back because of fears of smartphone-wielding citizens. His comments have drawn fierce criticism from civil libertarians, law enforcement analysts, and the White House itself – and rightly so.