…The obvious reason for this glaring omission is that the authors are constructing a morality-play in which the Jews must be portrayed as absolutely blameless victims, and even hinting at their role in the numerous Communist atrocities that long preceded the rise of the Third Reich might cause readers to consider both sides of the issue. When purported historians go to absurd lengths to hide such glaring facts, they unmask themselves as propagandists, and we must be very cautious about trusting their reliability and candor in all other matters, whether great or small. (Source)