One of the most important symptoms of pathological narcissism (the Narcissistic Personality Disorder) is grandiosity. Grandiose fantasies (megalomaniac delusions of grandeur) permeate every aspect of the narcissist's personality. They are the reason that the narcissist feels entitled to special treatment which is typically incommensurate with his real accomplishments. The grandiosity gap is the abyss between the narcissist's self-image (as reified by his False Self) and reality.
Narcissistic delusions rarely persist in the face of blanket opposition and reams of evidence to the contrary. The narcissist usually tries to convert his social milieu to his point of view. He attempts to condition his nearest and dearest to positively reinforce his delusional False Self. But, if he fails, he modifies his profile on the fly. He "plays it by ear". His False Self is extemporaneous - a perpetual work of art, permanently reconstructed in a reiterative process designed around intricate and complex feedback loops.
Though the narcissistic personality is rigid - its content is always in flux. Narcissists forever re-invent themselves, adapt their consumption of narcissistic supply to the "marketplace", attuned to the needs of their "suppliers". Like the performers that they are, they resonate with their "audience", giving it what it expects and wants. They are efficient instruments for the extraction and consumption of human reactions.
As a result of this interminable process of fine tuning, narcissists have no loyalties, no values, no doctrines, no beliefs, no affiliations, and no convictions. Their only constraint is their addiction to human attention, positive or negative. Narcissistic Personality Disorder is insufficient grounds for claiming a "diminished capacity" (insanity) defense. Narcissists are never divorced from reality - they crave it, and need it, and consume it in order to maintain the precarious balance of their disorganized, borderline-psychotic personality. All narcissists, even the freakiest ones, can tell right from wrong, act with intent, and are in full control of their faculties and actions.