Adolf Eichman was the Holocaust architect. Have you ever wondered how someone could do something so barbaric? He rounded up entire Jewish communites and shipped them like cattle to concentration camps. He knew exactly what he was doing. When he was finally tracked down 15 years after the war had ended, he said his only regret was that he had not been able to do a more thorough job.
For an exciting account of the search for him, read Hunting Eichman by Neal Bascomb. But Bascomb does not explore the roots of Eichman's thinking. For that you need to go to Creation Ministries and read their article "The Trial and Death of Adolf Eichman." Evolutionary thinking had permeated German society. Rejecting God as creator, they also rejected him as law-giver. The necessary consequence of this is that man's law is understood to be the highest one. There is no longer a higher law by which all of men's laws must be weighed. Eichman said he was only obeying orders. Man's orders. And because he was dead to the consciousness of his having broken God's law, he did not see his need for God's grace.
We should not scratch our heads if, throwing out God's good and perfect law, fallen man turns to barbarism. It is inevitable. Dispensing with God's law is like dispensing with the heavy glass cage that keeps your boa constrictor from slithering around your apartment.