Answer:
They believed that the Jews were guilty for all problems that erupted in Germany and that they are below Germans (Aryans) and should be removed from the face of Earth.
Step-by-step explanation:
The prosecution of Jews started long before WW2, after Nuremberg Laws were brought.
During the war itself, the decision that all Jews should be terminated was brought.
Known as the final solution, it led to murder of six millions Jews.