The first thing that came to mind when I heard about the mass shooting at the Super Bowl parade was, in the worst-case scenario, it might have been a terrorist attack. We didn’t know for a while what had happened, only that there was gunfire and many injuries and a frantic, chaotic scene in Kansas City. We’ve been thinking about Super Bowls and the risk of terrorism since at least 1977 and the movie “Black Sunday,” which was itself inspired by the massacre at the Munich Olympics in 1972.