Perhaps the most fascinating part of this letter is observing people's reactions to it. In the letter, the author goes so far as to admit that s/he is and always will be a psychopath without a sense of guilt or remorse toward others and a keen ability to recognize and exploit weaknesses in others for his/her own gain. Judging by the comments here, the letter has done just that. One comment below notes that "Jeez, tha…
Also, maybe I am wrong, but I don't think there are people who "just are" psychopaths? I mean, if it's chemical/hormonal, it could theoretically fixed that way... and if it's not, then it might not be "fixable", but it's not magic either, and layers and layers and layers of defense, redirections and rationalizations are expected. Nobody wants to accept that the center of their pearl is some banal, useless, accidental piece of dirt someone else or the wind put there. But that's usually what it is, I think. And pearls can kill, they're not pretty at all. They're like a scab turned cancer.
I agree that considering psychopaths as some spooky "other" is silly, it's all a matter of degree, and I guess we only call it psychopathic once it crosses a threshold. That is, I doubt anyone here can claim they never used someone, or calculated more coldly than they let on, or looked down on sentimentality when they didn't feel sentimental about a particular thing. Or maybe I'm projecting, I don't know. I know putting others down because I felt crappy, and for me that letter sounds like a much more elaborate and Machiavellian version, but still kinda the same.
TL;DR: The thing about the powerful is that they're not, that's why they need power, and of course the alligator part of the brain gets real good if that's all you use. Use your mammal brain to see what a small achievement that really is.