One of the most controversial parts of the movie Expelled: No Intelligence Allowed was the segment where Ben Stein interviewed the history professor Richard Weikart about his book, From Darwin to Hitler: Evolutionary Ethics, Eugenics, and Racism in Germany.It's hard to see how anyone can deny that the attempt to base an ethic on naturalistic Darwinism can lead to anything but a "might makes right" ethic. If what's right is what has evolved in the behavior of the human species then whatever human beings do - rape, violence, theft, bigotry - all must be right, and if they are, then whoever is the strongest gets to impose his will on all others. That's exactly what the Nazis thought and practiced.
Darwinists went apoplectic, deriding Stein and Weikart for daring to sully the good name of Darwin by showing the way that Hitler and German scientists and physicians used evolutionary theory to justify some of their atrocities, such as their campaign to kill the disabled.
Some critics even denied that the Nazis believed in Darwinism at all. Weikart challenges his critics to examine the evidence in his fascinating sequel, Hitler's Ethic: The Nazi Pursuit of Evolutionary Progress, which examines the role of Darwinism and evolutionary ethics in Hitler's worldview.
In this work Weikart helps unlock the mystery of Hitler's evil by vividly demonstrating the surprising conclusion that Hitler's immorality flowed from a coherent ethic. Hitler was inspired by evolutionary ethics to pursue the utopian project of biologically improving the human race.
Hitler's evolutionary ethic underlay or influenced almost every major feature of Nazi policy: eugenics (i.e., measures to improve human heredity, including compulsory sterilization), euthanasia, racism, population expansion, offensive warfare, and racial extermination.
Either morality is rooted in an omnipotent, omniscient, perfectly good being or there's no objective moral standard at all. If evolution is to be our standard then we are left with the ethic of the barbarian and savage - what's right is whatever feels right to me. This is egoism, i.e. the belief that one should put one's own interests ahead of the interests of others, and egoism, of course, leads inexorably to the ethic of "might makes right."
Hitler's "morality" was completely consistent with his rejection of a belief in a personal God. Hitler was who every atheist would also be if he/she a) had the power and b) were logically consistent.
Thankfully, few of them are both powerful and consistent, but in the 20th century some were. Mao, Stalin, Pol Pot in addition to Hitler were all atheists who had complete power within their sphere and acted consistently with their naturalistic, materialistic worldview.
The consequences were as horrific as they were predictable.