NARCISSISTS
Narcissists' brain is wired differently so incapable of changing from that behaviour.
Their brain cannot process compassion, empathy or remorse. So cannot be sorry for their actions.
That kind of brain has inability to step into your shoes (empathy).
Cerebral cortex forms the external nerve cell layer of the brain and this is different in narcissists.
Source: Manjit Kaur Ruprai, therapist