Why did hitler developed hatred for …

Religious Conflict – Conflicts between Christianity and Judaism have existed for years, which partly helped create an atmosphere of anti-semitism in Europe.
Anti-semitism in Vienna – Hitler spent a part of his youth in Vienna, Austria, where anti-semitism was very prevalent and highly advocated. He may have been influenced by some of the ideological ideas of that environment.
Jewish Economic Power – At the time when World War 1 broke out, a majority of financial institutions, banks and large companies were controlled by Jewish people.Hitler blamed the loss of the war, the economic downfall of Germany and the bad decisions of the Weimar Republic on Jewish capitalism.
Conspiracy theory – Hitler believed that the Jewish had some conspiracy to control the world and that they would stab Germans in the back whenever it would suit them.