Oxytocin and morality

A reader recommended this TED talk about the role of oxytocin and morality. The talk description:

What drives our desire to behave morally? Neuroeconomist Paul Zak shows why he believes oxytocin (he calls it “the moral molecule”) is responsible for trust, empathy, and other feelings that help build a stable society. 




 Here's what the reader said about it:


It seems relavant that he says about 5% of people do not release oxytocin upon the usual stimuli, and I usually see a predicted psychopathy incidence at around 4% of the population. Also, the background for individuals with this lack of release is similar to that often found of p/s types.


Could the distinction between empaths and sociopaths really as simple as that? Even if it is not, it's interesting to see how much of people's humanity is based on something as simple as a hormone.