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@the-gravedigger saidA bit of a stretch to call them 2 of the 'main' causes. Nobody really knows for sure and probably more to do with genetics. (Like a great many things).
Two of the main causes of NPD:
Parenting style of excessive criticism.
Unpleasant family life during childhood.
Not that I am claiming to be a psychiatrist of course.
To head off FMF, no, I do not think Dive has NPD.