Actually, there were not that many Jews living in Germany pre-WWII, as compared to Austria, where there was a much larger Jewish population, especially in Vienna. Perhaps this is where Hitler (an Austrian) developed his hatred for Jews, who did well as industrialists, some of whom were among the very wealthy. A little class envy and hatred is my guess. Hitler didn't have a pot to pee in, monetarily, when younger. Hitler brought his Jew hatred to Germany and instilled it in the population there by appealing primarily to their nationalism, softening them up for his preaching of hatred of Jews. He succeeded.