They were a young father of six and the cousin of an NFL player, a passionate defender of Israel who enjoyed debates and a community worker who dressed up as Santa Claus, some 14 victims in all, representing a tapestry of the multicultural American family, all gathered for what seemed the safest of occasions: a holiday party. The San Bernardino, Calif. Sheriff’s Department late Thursday released the names of those who died Wednesday night when a heavily armed man and woman burst into the room where they were enjoying a county health department banquet and opened fire. The male gunman,...