Seances and necromancy were very popular with Americans in families of recent immigrants during the 1800s. Too many Americans continue to this day to indulge in other superstitions considered to be idolatry (astrology, etc.).
The Nazis were evil, but their evil rose from a flaw in western civilization; it’s a flaw that needs to be corrected—not swept under the rug of historical revisionism (another Nazi indulgence).
What would that flaw be?