…but should remember exist even in those we think we know and love.
A quote from Common Everyday Sociopaths says it best:
Sociopaths don’t have normal affection with other people. They don’t feel attached to others. They don’t feel love. And that is why they don’t have a conscience. If you harmed someone, even someone you didn’t know, you would feel guilt and remorse. Why? Because you have a natural affinity for other human beings. You know how it feels to suffer, to fear, to feel anguish. You naturally care about others.
If you hurt someone you love, the guilt and remorse would be even worse because of your affection for him or her. Take that attachment and affection away and you take away remorse, guilt, and any kind of normal feelings of fairness. That’s a sociopath.