The correct answer to this open question is the following.
Alfons Heck first responded in awe to evidence of concentration camps and death camps. He was in shock when the allied forces showed him a documental with the atrocities of the Nazi Party in the concentration camps. He responded this way because when he was recruited by the Nazis, he and other young German people believed that they were fighting for their country and to defend its ideals against the enemies, but he never imagined the kind of horror and atrocities that Jewish people suffered in concentration camps, where the Nazis killed them in the gas chambers.