Many people do not realize that the Germans were methodically killing fellow Germans before they were killing Jews, gypsies, and dissidents. 'Action T4' was a medical program that quietly whisked disabled and mentally ill people for extermination. Germans of all ages were targeted. Hundreds of thousands received 'treatment.' Fewer people know that the philosophical foundations for the Nazi actions were laid many years earlier, even before the National Socialist party was created. In a sober, academic discussion, professors Karl Binding and Alfred Hoche argued that there were 'lives unworthy...