Most of who we are is our deepest emotions, and someone who cannot feel those emotions in a positive way is never going to understand much about his fellow human beings.

An intelligent sociopath can learn the rules about what's good and what's bad, what people see as good and bad. But they don't get that intervening sense of guilt, that pang of conscience, on account of it. So they tend to know what's wrong or right, they just don't care. That's another thing that they can use against us: that we do care. We're predictable in that.

Sociopaths are just like everybody else in that some of them are really brilliant, some of them are really stupid, and most of them are somewhere in between.

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.

In northwest Alaska, kunlangeta "might be applied to a man who, for example, repeatedly lies and cheats and steals things and does not go hunting, and, when the other men are out of the village, takes sexual advantage of many women." The Inuits tacitly assume that kunlangeta is irremediable. And so, according to Murphy, the traditional Inuit approach to such a man was to insist he go hunting, and then, in the absence of witnesses, push him off the edge of the ice.

The most reliable sign, the most universal behavior of unscrupulous people is not directed, as one might imagine, at our fearfulness. It is, perversely, an appeal to our sympathy.

Some parts of the population are starting to realize that character is extremely important and that it cannot be measured by the things we like to measure it by: the tabloids and so forth. Character is crucially important to a leader, to be a moral leader, and we'd better make it primary on our list or we're going to keep getting more of the same.