He slandered anyone who was not White Anglo-Saxon Protestant, which meant the Jews got the brunt of the harsh treatments. These started by just being forced to wear a yellow Star of David on the outside of their clothing, to having mandatory curfews enforced. Jews in the European nations during the World War II era were treated as second class citizens. Take it in a different perspective. Right now, Genocide is also being committed in Kosovo, fifty-plus years after liberating.
History does repeat itself.
The lessons of the Holocaust can be taught in the future. They will tell the stories of their loved ones, and make sure everyone knows that it can happen again. I know that the Holocaust did not only affect Eastern European Jews. During Hitler's raids he killed those who helped Jews, anyone that was thought to be guilty of espionage, anyone that was mentally or physically handicapped, those who believed in witchcraft, and many Catholics. Jews aren't the only ones who need to remember the Holocaust.