Another point I think is the role religion played in all this. The seeds for anti-Semites started with Martin Luther and the fact that the "Chosen People" of God didn't integrate with the rest of society. The Jews believed God made them superior to gentiles and would intervene and fight for them just as he did throughout the Old Testament. Many religious Jews didn't believe something like the holocaust could happen because God would come in a save his chosen people.

The Jews rejected the New Testament because it no longer gave Jews a special place in God's kingdom. They became seperated, the merchant and money lending class in society, so when the depressions hit Germany, they were the scapegoats.

Hitler also borrowed many of the propaganda and brainwashing methods from religion.