Sociopathy (antisocial personality diaorder) is already a diagnosed illness with it's main criteria being lack of empathy

Disregard for and violation of others rights since age 15, as indicated by one of the seven sub features:

Failure to obey laws and norms by engaging in behavior which results in criminal arrest, or would warrant criminal arrest
Lying, deception, and manipulation, for profit or self-amusement,
Impulsive behavior
Irritability and aggression, manifested as frequently assaults others, or engages in fighting
Blatantly disregards safety of self and others,
A pattern of irresponsibility and Lack of remorse for actions (American Psychiatric Association, 2013)