Heinrich Himmler quotes
... to put an end to the epidemics, we were forced to burn the bodies of an incalculable number of people who were destroyed by the disease. So we were forced to build crematoria, and on this account they are loosing a bond for us. "He also stated that he punished the culprit if the atrocities occurred in the camps." On the Einsatzgruppen: "The war on the Eastern front made the demands more difficult for our soldiers. A terrible climate, never-ending distances, an enemy population and constantly apparent partisans. Just because it was difficult, the troops prevailed. So they were forced to destroy entire villages if there was resistance and gunfire from such a village. Russians are not ordinary enemies, we can not understand their mentality. In the most desperate situations, they would refuse to capitulate. If, because of these difficulties in the East, the Jewish people suffered large casualties, it must be remembered that the German people also suffered severely."
Heinrich Himmler