The sun was just beginning to rise over the Rocky Mountains, but Sheriff Justin Smith was already awake. He was standing outside Fort Collins High School – shivering in the frigid cold. It was 12 degrees. Snow was falling. But Mr. Smith, wearing his dress blues, stood resolute, waving an American flag. The sheriff of Larimer County, Colorado had come to school Tuesday to send a message to those responsible for educating the county’s children. The sheriff was not in a good mood. He was standing in the winter snow to protest the school’s decision to ban a celebration of...