As soon as Yahoo’s Bianna Golodryga said she didn’t want to “turn political,” you knew that was precisely what she was about to do. But when Golodryga proceeded to criticize the Texas open-carry law this morning, you might be surprised that it was Meredith Vieira who—excuse the expression—shot her down. Vieira was a guest on Morning Joe to discuss a documentary, for which she served as executive producer, about the University of Texas Tower shootings in 1966, in which Charles Whitman shot 49 people, killing 16. The gun-control shoe was bound to drop, and after her “not to turn political,”...