I know the predominant thought on the matter. His mother country was heavily into the classification of ethnicity. This was also picked up from other places in his life. But I personally think his family doctor Eduard Bloch. Eduard Bloch - Wikipedia The doctor noted he never saw some mourn like Adolf did as his mother lay dying. So what if the fact this doctor could not save his mother pushed the hatred and then later, of course, he used it to focus people.