Thank you so much for adding value to the discussion! I need to admit that I love questioning and expanding my bit of knowledge anytime!

I was trained by the group of experts believing in the conditioning major role in triggering the genetic "predispositions", actually!

But as it’s still not fully confirmed by science, it wasn’t a good idea to be deterministic in my statement, you’re right! So, thank you for correcting me!

According to https://thenarcissisticlife.com/is-narcissism-genetic/:

"In the event that more research suggests that there is indeed a genetic predisposition, some questions will still remain. Is narcissism the result of a genetic predisposition which does not manifest unless the disorder is psychologically or physically triggered by childhood experience? Is the disorder purely genetic, passed down to a certain percentage of offspring, and requiring no triggering events or experiences at all? Considerably more work is needed before the causes of narcissism can be fully understood."