[Tichy]

Maybe you underestimate how charged today's atmosphere is. You get confronted with things like this every day - violence in the media, news, school yard, newspapers, books, video games. Peer pressure and what not. Kids beating each other up, filming it and putting it on YouTube.

I don't know if that kid is a psychopath but I can imagine lots of other reasons for how he got caught up in that "game".

Also I am not even sure about the psychopath verdict - I get that differences in the brain have been found (ie underdeveloped regions responsible for empathy). But that doesn't imply that it is genetic/not curable. I've read the same brain structures have been found in abused children, for example. And the famous London cab drivers with their enlarged brain regions for geo-spatial-whatever-things. They certainly were not born to be cab drivers - so if their behavior can make brain regions grow, why shouldn't it be possible to learn more empathy?