Re: Psychopath vs Sociopath
The difference is subjective.
From my limited understanding of the subject, psychopathy is genetic, whereas sociopathy is supposedly circumstantial.
Personally I think the latter is a myth, otherwise everyone subject to similar circumstances would become a psychopath, which is demonstrably not the case. Again, from my limited exposure to various research material, only 1% of the general populous is considered to be clinically psychopathic.
Someone like Shkreli, who would deliberately kill for no reason other than greed, then publicly sneer about it, is clearly one of them, especially given that there was absolutely nothing harsh about his extremely privileged circumstances at the time, that might otherwise have accounted for his behaviour.