"If you want to know what Hitler was thinking, look at what Himmler was doing. The essence of the popular understanding of the Holocaust is that Hitler ordered the genocide and that his followers persecuted and killed the Jews because they hated them.
Richard Breitman, author of the Architect of Genocide, disagrees with this functionalist view. he argues that Hitler, and the SS did indeed opt for mass murder because the logic of their anti-semitism, holding all Jews to be an implacable, mortal danger to Germany's existance, caused them to choose the most thorough going "final" solution imagineable. However, Breit