Ostensibly

"According to psychoanalyst Kernberg, "The normal tension between actual self on the one hand, and ideal object on the other, is eliminated by the building up of an inflated self-concept within which the actual self and the ideal self and ideal object are confused. At the same time, the remnants of the unacceptable images are repressed and projected onto external objects, which are devalued."
The merging of the "inflated self-concept" and the "actual self" is seen in the inherent grandiosity of narcissistic personality disorder. Also inherent in this process are the defense mechanisms of devaluation, idealization and denial. Other people are either manipulated as an extension of one's own self, who serve the sole role of giving "admiration and approval" or they are seen as worthless (because they cannot collude with the narcissist's grandiosity.)"