Please go back and read through this thread from the beginning. Or just look up James Fallon, who has been mentioned here several times. The scientific case for some instances of NPD being primarily a case of being wired a certain way is VERY strong.

What I’m interested in now is what about the other cases? We don’t seem to have anybody posting in this forum currently who is like that.

I don’t believe that my late father, who likely met the criteria, was like the people for whom it is mostly wired-in. And it sounds like you don’t feel that’s the case for your father either. If you look up “narcissistic personality disorder treatment” on the internet, there are cases of psychiatrists/psychologists who have treated people with NPD more or less successfully. And there are books out there, too, if you check on the booksellers sites.

Or, maybe, it would be more interesting to move into a discussion of "what is narcissism"?