on the moral conundrums of existentialism

Was there a higher degree of common evilness amongst the germans of the Third Reich than what could be found in for example the United States within the same time-frame? When the collective goes insane, how does one assess the criteria of culpability for the individual? If you, as an employer, refused and discarded the application of an emaciated, dire man over his ethnic and religious ancestry, were you an accomplice of the Holocaust? Maybe you did not even disfavor the Jews, maybe you did not give a damn about the racial hygiene, and maybe you even sympathized with their inhumane torments and discriminations? Would it make you an accomplice... of genocide? Where do one draw this line? Not surely can the yoke of the Holocaust be hung on the shoulders of one single man, but is it reasonable by the same token to hang it over the back of an entire people? Where is the middle-path here? May it be so that there is none.