pervasive pattern of disregard for, or violation of, the rights of others ... can involve a lack of empathy or remorse, false emotions, selfishness, grandiosity or deceptiveness; it can also involve impulsiveness, irritability, aggression, or inability to perceive danger

For the psychopath only the The Self and its immediate desires exists, has value.    

Ever since I learnt about confirmation bias I've started seeing it everywhere