@Siren,
Great answer. I just have a couple of quibbles with the website you cite. The first list is actually a psychopathy checklist. The way it is used diagnostically is that the individual is scored 0, 1 or 2 on each item, where 0 means the person doesn’t have the trait; 1 means they have a little of it; and 2 means they have a lot of it. You add up the items and if the person has a score of 19 or more, they meet the diagnostic criteria of psychopathy. The reason psychologists score the checklist in this way is to get around the natural human tendency to pick out a few salient traits and leap to a conclusion, which can be a very real danger if your emotions are in play.
Anti-social Personality Disorder (APD) is significantly different from psychopathy. In APD, the person is basically an asshole who has a long history of impulsive violence. Psychopaths are much more difficult to detect because they aren’t necessarily thugs. Rather, they lack the ability to understand the emotions and interior lives of others because their own emotions is strictly limited to those involved in the exercise of power. Being without conscience, empathy or remorse, they tend to rely more on manipulation than violence to achieve their aims. For more, check out this book.
The TV series Dexter presents an interesting insight into the psychological life of a psychopath. Of course, they have had to give him a few atypical characteristics to make him both interesting and sympathetic enough for people to relate to. First, most psychopaths are not killers, much less serial killers. Second, the existing diagnostic criteria tend to make impulsiveness a more central characteristic of the pathology. However, this may be due to the fact that the psychologists who developed the criteria did so mainly on prisoners. (Impulsiveness tends to get you caught.) Its been hypothesized that had the criteria been developed on a more representative sample, impulsiveness might not weigh so heavily.
Dexter Morgan strictly adheres to Harry’s code. And while to us this appears to be a moral code, this is a necessary fiction which enables us to relate to Dexter. For Dexter, the morality in Harry’s code is entirely incidental to its true purpose, which is to provide a formula for not getting caught. In fact, the way Harry gets Dexter to adopt it, is to show him an execution. What actually drives Dexter is the consummate feeling of power he gets from killing—which he ritualises both for practical reasons (i.e., not getting sloppy and not getting caught) and in order to savor the crucial moment.
If Dexter did not have Harry’s code, and lived purely to satisfy his own need for power (as psychopaths are prone to do) he would be too evil for us to contemplate. In a criminal profiling course I once took I saw several interviews with psychopaths, most of them quite chilling. I saw one where a psychopath was openly bragging about how he had systematically terrorized his step-child into becoming his sex slave. I also saw a tape left behind by Leonard Lake documenting how he would abduct women and condition them to cooperate in their own captivity and eventual murder.
Fortunately, these cases are quite rare, despite the impression you get from Fox News and TV crime dramas that evil is lurking everywhere. Of more concern are systemic evils like official policies sanctioning torture. There has been some recent brain research showing that the pleasure centers of the brain light up when you inflict pain on another. This explains why the behavior is so addictive to the perpetrator, and how, once it gets started, it can sweep through penal institutions like an epidemic.
Unfortunately, torture can radicalize a person to such a degree that it submerges his capacity for empathy, conscience and remorse. For example, Al Zawari, Osama Bin Laden’s second in command, was tortured in an Egyptian prison for an unimaginable three years. So, in this respect, evil does not appear suddenly and inexplicably out of nothing. But, rather, it is often a ripple effect of conscious political decisions.
There is a controversy among psychologists as to whether psychopathy is congenital, or whether it can be induced in a person by extremely aversive childhood abuse. No doubt both are involved. If a child is neurologically predisposed toward psychopathy, severe early childhood abuse may cause it to manifest in extremely anti-social ways. And, once started, it can sweep through populations, especially during times of war and civil disorder.
It would therefore behoove us to reconsider our policies of mass incarceration over minor things like drugs. Prisons may create more evil than they contain.