To get into more detail, sociopathy arises when a deep bond shared with someone is broken by the person with whom it is shared. It's a betrayal that can never be rectified. The trauma said person caused is one that can't be rationalised or justified. We can't make sense of it, but we know we are not the ones to blame. A personal conflict arises. We are the victim of someone who we had such trust in. We can't recover from that, so we change. We adapt to expect this behaviour from anyone - after all, if the person we bonded with can cause such a thing, what the fuck will stop anyone else in the world? It becomes a game to us - the world, life, people. We've seen how ugly it can be, so we're prepared to be just as ugly if and when we need to. We don't feel sorry because there was no one to feel sorry for us. Fuck your feelings.
Corey Reaux-Savonte on defining the Sociopath.