Hitler was known to have a passion for hating Jews from as early as when Germany lost World War One. He believed, and made others believe, that the Jews were at fault for this loss and for the pain that Germans suffered because of this. Although Hitler was actual Austrian, he believed German blood was pure and all other bloodlines, especially Jewish, should ultimately be destroyed. He believed that Germany should be only German, with no other blood line allowed to survive. That's why he want to kill all the Jews.
His hate for Jews came at an early age, beginning with his mother’s death. A Jewish doctor treated his mother but could not cure her illness. She died, leaving young Adolf Hitler blaming the Jewish doctor. Hitler seemed to have a chip on his shoulder when things did not go as he had planned. Unfortunately, for the Jewish people, most of his let-downs in life could be attributed to someone of Jewish culture. Schools and businesses that Adolf was turned down by all were Jewish. The Jewish religion, at that time, was already very large, and steadily growing in many areas of Europe, so it would be likely that any place that would have either accepted, or denied, him would have leaders and business owners who were Jewish. Again, this was unfortunate for the Jewish people, as World War Two would show.