I don't think it's a mystery that morality is subjective.
Somewhat. Ehrm, mostly.
Does tend to include what social science calls "prosocial behaviors" for a lot of people, and a lack of "antisocial behaviors":
People feel guilty when they do not reciprocate and they may feel angry when someone else does not reciprocate. Either reciprocity or altruism may motivate many important prosocial behaviors, including sharing.[4]
Prosocial behavior is more likely to occur if the cost of helping is low (i.e. minimal time, or minimal effort), if helping would actually benefit the individual providing the help in some way, and if the rewards of providing the help are large. If it is in an individual’s interest to help, they will most likely do so, especially if the cost of not providing the help is great.[15]
http://en.wikipedia.org/wiki/Prosocial_behavior
From this page...the negative opposite:
http://www.healthofchildren.com/A/Antisocial-Behavior.html
So it is perhaps not just necessary to violate norms, but to be actually disruptive and hostile, I suppose?Antisocial behaviors are disruptive acts characterized by covert and overt hostility and intentional aggression toward others.
Asocial seems to be used almost as a synonym with antisocial; however, the precise definition of asocial is avoidance, not harm:
http://www.merriam-webster.com/dictionary/asocialDefinition of ASOCIAL
: not social: as a : rejecting or lacking the capacity for social interaction
(Always best to go for definitions around here. Flamewars ensue because people say the same things differently, then think they disagree and start shouting. It's like me and the wife, I swear...)