From my seat at Super Bowl LIX, the crowd’s disparate reactions to Swift and Trump felt like a chilling microcosm of our culture. …It was just a football game, people might say. Or Swift—who is famously dating Kansas City Chiefs tight end Travis Kelce—got heckled by some rowdy Eagles fans excited to be at the biggest sporting event of the year. So? Don’t take it so seriously. …Perhaps the moment would have felt less visceral if not for the fact that less than an hour earlier the crowd had exploded—this time with applause—to see Trump on that same screen. As...