Jazz already wrote the definitive take on the grisly execution-style shooting of two New York City police officers and the role that irresponsible commentary from elected leaders – particularly Mayor Bill de Blasio – might have played in that attack. Jazz is right to question the part that the mayor’s self-indulgent and unhelpful rhetoric might have played in this incident. Hours after a Staten Island grand jury’s decision to issue no-bill for the death of Eric Garner, de Blasio went on an ill-advised tear in which he impeached the NYPD based solely on his prejudices. “That should never have to...