Funny you should mention that.
In this mornings Wail
http://www.dailymail.co.uk/news/art...parated-birth-sinister-social-experiment.html
Seems to me that Behavior and temperament are highly inheritable.
However, life experiences can also have a strong effect too. Not just because the brain is malleable and will develop different pathways through life as a result of different experiences, but also because ones active genetic make up is malleable too.
A pair of identical twins might well have identical genetic make up at conception, but that does not mean that they do so 20-30 years later since we all carry genes that can be switched on or off as a result of external experiences (Sometimes these changes can actually be passed on to children. EG I remember reading that Children born to people who have experienced severe malnutrition are born with normally inactive genes switched on that can help people survive this. However there are downsides which are disadvantageous if food is abundant, which is why those genes are not switched on all the time)
Unlike Autisim, which I would not expect to confer many survival benefits. Psychopathy actually confers many survival/reproductive benefits.
Even in heavily regulated and collectivized modern societies, Psychopaths who manage to keep on the right side of the Law often do really rather well.
In earlier less regulated and more individualistic societies I would have thought that many aspects of Psychopathy would be a big survival/reproductive advantage.
Autistics would likely find it hard to survive in any form of society. Psychopaths are only really considered to be suffering from a medical condition if their temperament compromises their ability to function successfully within society so its status as a medical condition is far more grey area.