Lorric, you are making a series of assumptions that really aren't supported by the research that has actually been conducted on psychopath/sociopathy/ASPD.
A lot of what you're saying seems to come down to this ingrained notion of right/wrong, which is what I'm actually talking about when I say social rules. I (and researchers) call these things social rules because they are a derivative of society, and not something that's ingrained in people from birth. Most of the norms and social rules we live our daily lives by are entirely learned (and without giving a lecture on behavioural genetics, we'll just say that there is a genetic basis for behaviour, but its more a predisposition to living in social groups than specific behaviours). Psychopaths/sociopaths differ in parts of their brain from most people, but it's not because they don't have an ingrained notion of social rules - far from it, they understand these rules implicitly - they simply have less of a resistance to breaking them due to a variety of their personality traits. But as I said, everyone can and will break certain social rules given means, opportunity, and motive. Plenty of people speed behind the wheel - that's a social rule being broken, and you endanger others by doing it. Murder is also the breaking of a social rule. The difference between a normal personality and a psychopath/sociopath is that a normal person feels remorse when breaking social rules, and the level of remorse (and therefore inhibition) escalates with the magnitude of the rule-breaking. For a psychopath/sociopath, there is no remorse. They understand on a conscious level that society views murder as a more serious crime than speeding, but they simply do not care - it doesn't bother them. Remorse is therefore not a barrier to them. So like I said before, it's not that psychopaths/sociopaths kill for no reason, it's that the reasons a normal person might not kill don't have any effect on them.
Now, generally when someone asks for a citation around here they mean a specific reference for a claim you're making. Dumping generic links and telling someone to find it yourself usually doesn't go well or lend credence to an argument. I'll also point out that the links you've posted are not what I'd call credible sources - fact-checked, peer-reviewed, or research-based. None of them list their sources, and any website claiming to be a haven for sociopaths is probably a haven for narcissists and other people with delusions of grandeur that think they're sociopaths but actually aren't.
And again, it's not that psychopaths/sociopaths are unable to feel any emotion except anger, it's that they tend to exhibit emotional detachment generally, and often simply do not care. They can experience anger, grief, love, hate, longing, melancholy, irritability, etc - just not in the same sense as a normal individual.
Anyway, narcissism is often confused with psychopathy/sociopathy, but they aren't the same things. Narcissists are all about feeling their own self-worth, have impulse control, and can feel remorse. Psychopaths/sociopaths are characterized by lack of impulse control and remorse, but they are not defined by an obsession with sense of self. Narcissism is a motivating personality disorder; psychopathy/sociopathy is a disorder which can enable certain behaviour.
I'd you suggest you delete said links altogether, as they are garbage, and do some academic reading instead from legitimate sources. You asked about the pro-social psychopath information; the best reference I can suggest is an
Abnormal Psychology textbook. Amazon sells them. I have the
Canadian edition (the older one, not this link), but they're all pretty similar (stats just differ by country).
As for Mr. Fallon, he is a neuroscientist who also happens to have the brain physiology (and some of the personality indicators) of a psychopath/sociopath. His 15-minute youtube clip is well-worth listening to, as he explains some core concepts.
Anyway, if you find this subject interesting, take some college/university-level classes in Psychology. The university I attended offered abnormal psychology as a 300-level class with minimal pre-requisites, so it's an option even for those that don't major in psychology (I didn't).