Why did the Nazi perpetrators do what they’ve done?

 1. NAZI concentration camps and 2. Wehrmacht / Polizeibataillon 101 (Reserve Police Battalion 101) / Einsatzgruppen der Sicherheitspolizei und des SD (“task forces” or “deployment groups“) behaved after 1945: How did they justify their behavior during the Nazi time? Are there specific reasons that came up more often than others? How did they feel working […]