When Hitler was Chancellor of Germany he convinced A LOT of people that the Jewish people were to blame for every thing. In debt? Because of the Jews. Your dog ran away? Because of the Jews. As crazy as it may seem, people still chose to believe him. He was very persuasive, and the people of Germany didn't really know how bad the situation was. They were simply following their leaders orders. This later led obviously, to the Holocaust, and World War II.
To be honest Hitler was smart about this, frankly, idiotic plan to wipe out everyone not the Aryan race. He convinced people that he was right, promised them things, and started becoming almost a role model for children. Children are the future, and he wanted this to last long after him.