From The Jewish Enemy, (Herf, 2008)

“If not identified and destroyed, the Nazis propagandists feared, Jewry would annihilate the German people.  As a result, Hitler and his associates publicly declared on numerous occasions that they would “exterminate” Jews before the Jews could exterminate the Germans (page 7)
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“Anti-Semitism was at the center of Hitler’s attack on Roosevelt. “We know what powers stand behind Roosevelt.  It is the eternal Jew who thinks his time has come to inflict on us what we shudder to see and must experience in Soviet Russia.” It was, he continued, “Franklin Roosevelt’s and the Jews’ intention to destroy one state after another.” The war was a matter of the “existence or nonexistence” of nations. 

If given the opportunity, Roosevelt and the Jews “would now exterminate National Socialist Germany.” The United States under Roosevelt was striving for unlimited world domination” and would deny Germany, Italy, and Japan the necessities of national survival.  For the “National Socialists,” he continued, it was “no surprise that the Anglo-Saxon Jewish capitalist world [found] itself in a common front with Bolshevism.”

“Despite the vast literature on Nazis Germany, World War II, and the Holocaust, the rationalist bias about human motivation has persisted, reinforced by the positivism of the social sciences and challenges to intellectual and cultural history within the discipline of history. Resistance to grasping the power and impact of nonrational and irrational currents in Nazis Germany has been considerable.” (pages 131-132)
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“The Nazis leadership pushed to the extreme the widespread human capacity for delusion and belief in illusions. The assumption that these men did not believe these fantasies relies on an optimistic view of the power of human rationality, justified neither by the events of modern history nor by our now widespread awareness of the role of nonrational forces in human experience.

“The weight of evidence leads to the conclusion that members of the Nazis leadership viewed the world in the way that they said they did, and supplied a narrative of events that seemed to offer an iron-clad explanation of them as well as justification for uniting ideology and practice in war and mass murder.

"If sheer repetition, in public and private contexts, can be taken as proof of belief, then it appears that Hitler, Goebbels, Dietrich, their staffs, and an undetermined percentage of German listeners and readers believed that an international Jewish conspiracy was the driving force behind the anti-Hitler coalition in World War II.  

"If they regarded this aspect of their own propaganda with cynicism, they did not leave much trace of that skepticism behind.” “Yet the sources point to the presence of true believers. They certainly acted as if the Final Solution was Nazi Germany’s punishment of the Jews, whom the Nazis found guilty of starting and prolonging World War II. Sincerity of belief was a secondary matter." (pages 269-270).