..and did long ago descended into unintentional self parody.
The Roaming Gnome assures us no serious scholars are so naive as to believe otherwise than has just been detailed, but many are afraid to say so, for fiduciary reasons. He, though, Brave Sir Robin, is trumpeting the Truth. (Brave Sir Robin, who worked for the "most vile institution on earth" (his quote) the Pentagon, and has quite the cottage industry going, and is very well off for doing so. How's that investment portfolio Doc?
Now 'all competent scholars agree that' the German press of the day either did not see the true cause of the troubles, or assiduously avoided pointing the finger of blame where it should. The "real bad guys' for WWI and Wiemar era Germany: German and international corporate entities and their allied (or puppet) nations (amongst which certainly a Prescott Bush must have been involved!) aka; the dreaded 'war profiteers'. (These can be blamed for the war itself, Versailles, and the economic conditions in pre-Nazi Germany.)
Now, because of the amazing success of the propaganda aspects of the conspiracy (which has been going on for quite some time, at least as long as modern capitalism) there was, as there is now, an explanatory gap that needed filling, and because no one from the media or educational institutions filled the gap (due to their complicity in the corporate conspiracy or their having been duped by said conspiracy and its cooperating media), and because the plebeians had been so thoroughly propagandized as to literally not be able to see the truth, the Nazis provided an incorrect explanation, blaming the Jews and Bolsheviks, claiming that they were the conspirators.
Now, we can understand Chomsky's claim that today's right wing radio hosts and today's plebeian inhabitants of what amounts to a political version of Plato's cave, find themselves playing out the same drama. Consequently, he claims there is danger of something happening in the U.S. that would parallel what happened during the Nazi era, with 'liberals' being the victims of a new repression.
Now, to get to the ironic bit; Much of Chomsky's story here is standard issue socialist or communist thinking. It was also the stock and trade of the new left, and Chomsky rose to prominence as a public intellectual during the Viet Nam war making such claims. In short, this is very much the heart of the world view of liberal and progressive circles. You hear it, or watered down versions of it, from many people of influence in the Democratic party.