Liberal consensus has dumbed Nazi atrocities down to just being about the Jews. Maybe it is just easier for liberals to understand a simpler story with fewer protagonists or maybe accepting the totality of Nazi crimes would disturb the liberal view of reactionaries as essentially good and normal people who just happens to hate a few well-defined and clearly demarcated minorities. Maybe accepting that reactionaries are rotten to the core doesn't go too well with their fetish for being civil and submissive to everyone to their right.