On Thursday evening, Edward Archer approached Philadelphia police officer Jesse Hartnett and proceeded to shoot at him 13 times. Friday morning, he professed to have done so in the name of Islam, and it's reported that he has pledged his allegiance to ISIS. This violent attempt to murder a law-enforcement officer is in keeping with ISIS's ongoing effort to attack those whose job it is to keep America safe, as we have seen in Fort Hood, Boston, and Chattanooga. Yet in the wake of another attack in the name of radical Islamic terrorism, it is unfortunate that we have already...