The sad reality is that although there were some dissenters, the majority of the people in the country supported the Nazis because they actually believed it, they were taken in by the propaganda, which is insidious and ubiquitous. Humans find it easy to hate an out group, forming an in group. Dehumanising others who are different from us is a natural part of human psychology, and it’s an achievement that in the modern world we have achieved a widespread morality which is so accepting - although obviously we still have far to go.