This whole thread strikes me as having a very strong 'us vs. them' mentality. The guy in his letter makes a plea that 'Psychopaths are just people.' and the general feeling of these comments is to completely throw this away and view psychopaths as a dangerous and scary group of people.

Psychopaths look at the world differently than we do, they are highly rational and self motivated, but that doesn't need we need to fear them, hide from them, avoid them, or try to lock them up. There are more ways to deal a person like this.