Read the first seven parts of the chapter entitled
"Meet the Narcissist."
A narcissist's need to "have it all" invests him or her with a spirit hostile to the needs and well being of others.
Recall the analogy in The Danger of Narcissism: If you feel a compelling need to have all the dollars in the world, no matter how many you get, you will compete with others for every single one; and if you see a dollar in someone else's hand, you will want to take it away. Just because he has it. That makes you an adversary of everyone else in the world. It makes you view the possessor of a dollar as a predator views prey.
Therein lays the "malignance" in malignant narcissism. So narcissists are desperate to keep its presence in them a secret. That is why they invest so much energy in the false image of themselves they carve out with everything they do and say.
Indeed, every predator must find some way to stalk its prey without arousing suspicion. The narcissist is a wolf in sheep's clothing.