Talk about killing the messenger . . . Mike Barnicle has blamed the New York Post for the fact that New York City has become less safe under Mayor Bill de Blasio. On today's Morning Joe, Barnicle--holding up the front page of today's Post--whined that part of the problem is "the way crime is now covered in this city--especially in this paper, okay? If someone is shot in Times Square, or a guy with a hatchet in midtown is attacking people, it's on the front page." Boo-hoo. The fault, dear Barnicle, is not in the Post, but in de Blasio,...