Adolf Hitler

In high school, we didn't study the Holocaust nearly as much as I think is necessary. Most of my knowledge on the subject has come from taking my own initiatives to learn the subject. The only perspective that I've ever gotten is from the side of the Jews who were most obviously the victims in the case. I always have wondered what the psychological issues and the reasoning that Hitler used to justify the atrocities that he committed. These readings from Mein Kampf gave me a little bit of insight but there are still things that I don't understand. I don't anyone ever truly will. 

In Chapter IV he writes, "People who can sneak their way into the rest of mankind like drones, to make other men work for them under all sorts of pretexts, can form states even without any definitely delimited living space of their own. The applies first and foremost to a people under whose parasitism the whole of honest humanity is suffering, today more than ever: the Jews." 

I don't see why the Jews were considered "parasites" and no other group of people were. During the time that Hitler rose to power, the German economy was destroyed and nearly everyone was poor. What differentiated the Jews from the poverty? What made them more parasitic than any other group of people? 

The only conclusion that I can come up with is that Hitler was threatened by the Jews ability to have a nation without a state. He must have seen that as some sort of legitimate threat to his power.