- Not only did Hitler thank the Jewish doctor who treated his mother, apparently he allowed the doctor to escape Nazi Germany without repercussions. (Doesn't sound like he was too angry at the man).
- He didn't only kill Jews. He killed Communists, liberals, homosexuals, gypsies and many other groups, including millions of victims of warfare. Why he did is up for debate, but I'd guess a mixture of antisemitism and stereotypes of the as Jews as Communists, subsersives and all kinds of other things - as a means to an end. A common way to gain power is to spread fear and panic about an enemy (real or imaginary), stir up hatred and present yourself as the only person able to 'save' the country.