You mention three different types of victims of the narcissist. What things would cause a narcissist to victimise a significant other sadistically versus just discarding them when no longer useful?
The narcissist simply discards people when he becomes convinced that they can no longer provide him with Narcissistic Supply. This conviction, subjective and emotionally charged, does not have to be grounded in reality. Suddenly - because of boredom, disagreement, disillusion, a fight, an act, inaction, or a mood - the narcissist wildly swings from idealisation to devaluation.
The narcissist then detaches immediately. He needs all the energy he can muster to obtain new Sources of Narcissistic Supply and would rather not spend these scarce resources over what he regards as human refuse, the waste left after the extraction of Narcissistic Supply.
A narcissist would tend to display the sadistic aspect of his personality in one of two cases:
- That the very acts of sadism generate Narcissistic Supply to be consumed by the narcissist ("I inflict pain, therefore I am superior"), or
- That the victims of his sadism are still his only or major Sources of Narcissistic Supply but are perceived by him to be intentionally frustrating and withholding. Sadistic acts are his way of punishing them for not being docile, obedient, admiring and adoring as he expects them to be in view of his uniqueness, cosmic significance, and special entitlement.
The narcissist is not a full-fledged sadist, masochist, or paranoiac. He does not enjoy hurting his victims. He does not believe firmly that he is the focal point of persecution and the target of conspiracies.
But, he does enjoy punishing himself when it provides him with a sense of relief, exoneration and validation. This is his masochistic streak.
Because of his lack of empathy and his rigid personality, he often inflicts great (physical or mental) pain on meaningful others in his life - and he enjoys their writhing and suffering. In this restricted sense he is a sadist.
To support his sense of uniqueness, greatness and (cosmic) significance, he is often hypervigilant. If he falls from grace - he attributes it to dark forces out to destroy him. If his sense of entitlement is not satisfied and he is ignored by others - he attributes it to the fear and inferiority that he provokes in them. So, to some extent, he is a paranoid.
The narcissist is as much an artist of pain as any sadist. The difference between them lies in their motivation. The narcissist tortures and abuses as means to punish and to reassert superiority, omnipotence, and grandiosity. The sadist does it for pure (usually, sexually-tinged) pleasure. But both are adept at finding the chinks in people's armours. Both are ruthless and venomous in the pursuit of their prey. Both are unable to empathise with their victims, self-centred, and rigid.
The narcissist abuses his victim verbally, mentally, or physically (often, in all three ways). He infiltrates her defences, shatters her self-confidence, confuses and confounds her, demeans and debases her. He invades her territory, abuses her confidence, exhausts her resources, hurts her loved ones, threatens her stability and security, enmeshes her in his paranoid state of mind, frightens her out of her wits, withholds love and sex from her, prevents satisfaction and causes frustration, humiliates and insults her privately and in public, points out her shortcomings, criticises her profusely and in a "scientific and objective" manner - and this is a partial list.
Very often, the narcissist sadistic acts are disguised as an enlightened interest in the welfare of his victim. He plays the psychiatrist to her psychopathology (totally dreamt up by him). He acts the guru, the avuncular or father figure, the teacher, the only true friend, the old and the experienced. All this in order to weaken her defences and to lay siege to her disintegrating nerves. So subtle and poisonous is the narcissistic variant of sadism that it might well be regarded as the most dangerous of all.
Luckily, the narcissist's attention span is short and his resources and energy limited. In constant, effort consuming and attention diverting pursuit of Narcissistic Supply, the narcissist lets his victim go, usually before it had suffered irreversible damage. The victim is then free to rebuild her life from ruins. Not an easy undertaking, this - but far better than the total obliteration which awaits the victims of the "true" sadist.
If one had to distil the quotidian existence of the narcissist in two pithy sentences, one would say:
The narcissist loves to be hated and hates to be loved.
Hate is the complement of fear and narcissists like being feared. It imbues them with an intoxicating sensation of omnipotence.
Many of them are veritably inebriated by the looks of horror or repulsion on people's faces: "They know that I am capable of anything."
The sadistic narcissist perceives himself as Godlike, ruthless and unscrupulous, capricious and unfathomable, devoid of emotions and asexual, omniscient, omnipotent and omnipresent, a plague, a devastation, an inescapable verdict.