[Lyra]

Others suffer from similar disorders.

https://www.psychologytoday.com/blog...issistic-trait

Lack of empathy is one of the most striking features of people with narcissistic personality disorder. It's a hallmark of the disorder in the same way that fear of abandonment is in borderline personality disorder.

http://psychcentral.com/disorders/an...rder-symptoms/

Individuals with Antisocial Personality Disorder frequently lack empathy and tend to be callous, cynical, and contemptuous of the feelings, rights, and sufferings of others.

http://sfhelp.org/relate/empathy.htm

Childhood - as early as infancy - is now known to be a critical time for the development of empathy. And although children can be astonishingly resilient, surviving and sometimes thriving despite abuse and neglect, studies show that those who experience such early trauma are at much greater risk of becoming aggressive or even psychopathic later on, bullying other children or being victimized by bullies themselves.