How to Reason with a Narcissist | Can they be Persuaded?

This video answers the question: Is there any way to persuade narcissist? I've heard other versions of the same question: Is there any way to reason with somebody who's narcissistic? Is there any way to encourage behavioral change?
Narcissism is on a continuum. If we believe somebody is narcissistic that doesn't necessarily mean anything. We would have to know what traits they have and to what extent. The continuum extends from healthy, normal, and adaptive on one end all the way over to pathological on the other end. One of the pathologies that's associated with narcissism would be narcissistic personality disorder, but somebody wouldn't necessarily need to have that to have narcissism that's interfering in their life or to have narcissism that's making it difficult to interact with them. There are two types of narcissism: grandiose (overt) and vulnerable (covert). Grandiose narcissism is characterized by a sense of entitlement, arrogance, social dominance, and confidence. Somebody who has grandiose narcissistic features genuinely believes they are superior.
vulnerable narcissism is characterized by hypersensitivity to criticism, insecurity, anger, aggression, and a lot of shame. Somebody who has vulnerable narcissistic features doesn't fully believe that they are superior. They are trying to believe they're superior, but they don't quite buy the self-deception.