"The overall effect of Hitler Youth membership, some Social Democratic observers complained, was a ‘coarsening’ of the young. The suppression of any discussion or debate, the military discipline, the emphasis on physical prowess and competition, led boys to become violent and aggressive, especially towards young people who for whatever reason had not joined the Hitler Youth. Hitler Youth groups travelling by train amused themselves by insulting and threatening guards who failed to say ‘Hail, Hitler!’ every time they asked a passenger for his ticket."