Yesterday in The Washington Post, Michael S. Rosenwald wrote a story offering up an explanation for mass shootings in the United States. It’s an interesting hypothesis he described, but the story left me unprepared for the most haunting video I’ve seen about gun violence in the U.S., a video which appears at the end of Mr. Rosenwald’s article. There is a short ad you have to watch for a few seconds before the video called “2015: A Year In Mass Shootings” begins. Here's the link.