Nazi forces were the only ones that didn't rape (they'd be shot). Hitler let the Limeys escape at Dunkirk. His camps had sports teams, theaters and at least one had a swimming pool. Zyklon B was used to kill lice and prevent typhus, not to kill people (it probably would have been very bad at that).
Fun fact, a German Jevv invented DDT but the Germans didn't know it killed bugs. The Allies knew but didn't tell the Germans.