Everything you Need to Know about Narcissists, Psychopaths, and Abuse - click on this link: http://www.narcissistic-abuse.com/faq1.html
Psychopaths regard other people as objects to be manipulated and instruments of gratification and utility. They have no discernible conscience, are devoid of empathy and find it difficult to perceive other people's nonverbal cues, needs, emotions, and preferences. Consequently, the psychopath rejects other people's rights and his commensurate obligations. He is impulsive, reckless, irresponsible and unable to postpone gratification. He often rationalises his behaviour showing an utter absence of remorse for hurting or defrauding others.
Their (primitive) defence mechanisms include splitting (they view the world -- and people in it -- as "all good" or "all evil"), projection (attribute their own shortcomings unto others) and Projective Identification (force others to behave the way they expect them to).
The psychopath fails to comply with social norms. Hence the criminal acts, the deceitfulness and identity theft, the use of aliases, the constant lying, and the conning of even his nearest and dearest for gain or pleasure. Psychopaths are unreliable and do not honour their undertakings, obligations, contracts, and responsibilities. They rarely hold a job for long or repay their debts. They are vindictive, remorseless, ruthless, driven, dangerous, aggressive, violent, irritable, and, sometimes, prone to magical thinking. They seldom plan for the long and medium terms, believing themselves to be immune to the consequences of their own actions.
(From the book "Malignant Self-love: Narcissism Revisited" by Sam Vaknin - Click on this link to purchase the print book, or 16 e-books, or 2 DVDs with 12 hours of video lectures on narcissists, psychopaths, and abuse in relationships: http://www.narcissistic-abuse.com/thebook.html)
