The last-place cable news network hits rock bottom, but still keeps digging.Among the errors to which journalists are prone, none is so common as the delusion of instant expertise. Assign a reporter to do an article about theoretical physics, and by the time he files his story, he’ll be convinced he’s Stephen Hawking. You see this sort of phony expertise everywhere in the media nowadays, including sports, where every ESPN panelist offers his predictions with rock-solid confidence, and never acknowledges his mistake when the team he’d picked to win ends up on the wrong side of a lopsided blowout. Trafficking...