Cognitive Dissonance, John Rabe and the Nanking Massacre

Think of the most vile and absolutely evil group of people in human history. Does anyone in particular come to mind? If you were to ask people on the street, 9 times out of 10, people would likely say the Nazis were the epitome of pure evil. But what if I told you there was one Nazi in particular responsible for saving the lives of nearly 200,000 people.