Oh, it gets worse. While NPD has a genetic component, like all personality disorders it seems to be triggered by early childhood trauma. It would seem that if you get abused by your parents badly enough to get a personality disorder, genetics determine whether you get NPD or something else like BPD. The hatred of people with NPD is victim blaming. It's saying you're evil cause your parents abused you. Here are My other articles about NPD:

https://medium.com/@viridiangrail/anarcho-narcissism-b647c8062173

https://medium.com/@viridiangrail/why-reactionaries-hate-pride-and-narcissists-938d39261f13