The reason I want to explain that you're probably never going to get revenge a sociopath and you're also probably not going to redeem this person, is that it is not a project that will ever succeed. At present, if a person does not have a conscience, we know of no way to instill one - not even a little bit. It's not like something you can take off the shelf and put into somebody's brain. It makes me so sad to hear people say, "I think I can see just a little bit of a conscience."

I would hesitate to tell people to stop being kind or sympathetic to sociopath. But just like loyalty, some things that can be taken advantage of are empathy, sympathy, and our tendency to pity somebody when something has gone wrong in their life.

The physical basis for sociopathy is approximately 50 percent inheritable, which sounds more dramatic than it probably is, because most personality characteristics that psychologists test for and study the genetics of are about 50 percent inheritable. Introversion, extroversion, it turns out that they're about 50 percent inheritable, which means that somehow sociopathy is physical, it's organic.

Controlling others—winning—is more compelling than anything (or anyone) else.

When I speak of divisions greater than gender or race, I say that because it is so unimaginable. I can imagine what it would be like to be another race. Or to be a man - I could draw that up in my mind and experience it. Schizophrenia? We're all schizophrenic in our dreams. Depression? Most of us have been at least a little depressed and can imagine it. But not having a conscience? Conscience is so profound and so basic in most of us.

The sociopath wants the person to be easily enough fooled to stick with him. This can be accomplished by looking for someone who is very, very loyal. Most of us consider loyalty to be a very positive trait - and it is a positive trait. But it also blinds people to some of the traits of the person they're loyal to.

To learn to be charming is fairly easy - you can teach somebody to be charming and to learn human emotions - or to learn the behaviors that go with human emotions. A sociopath, a smart one, will study the way we emote, and will learn how to do that quite effectively.