Society indirectly supports NM

http://www.daughtersofnarcissisticmothers.com/mothers-with-narcissistic-personality-disorder.html

Narcissistic Mothers

Most people never even think of the possibility of narcissistic mothers. We have a huge cultural embargo upon thinking badly of mothers. We esteem mothers, put them on pedestals, worship them almost. I've read that this cultural indoctrination is why the fairy stories always feature wickedstepmothers- because to speak of wicked mothers is just undoable. I think there's a lot of plausibility in this theory.