Walk down a street in a European capital on a day of protest. You see a crowd of demonstrators waving flags, chanting slogans. If the crowd is Muslim, the air feels different: angry chants, faces twisted in rage, threats against Israel, sometimes…

Walk down a street in a European capital on a day of protest. You see a crowd of demonstrators waving flags, chanting slogans. If the crowd is Muslim, the air feels different: angry chants, faces twisted in rage, threats against Israel, sometimes…