http://www.nowandfutures.com/large/ImplicationsOfCorporatePsychopaths%28boddy%29.pdf
This is a very good analysis of psychopaths in business. Only 1% of the general population are psychopaths but as one goes up the ladder the psychopaths increase in numbers for it is an environment favorable to their mode of operation.
Of course, the size of the amygdala is variable so people will have different ranges in the emotional repertoir. The most basic would be fear and anger which is animalistic. This is the 'fight or run' response. This is survival at its most basic level and suited in an emergency situation. In a peaceful situation other emotions might come into play like love, fellowship and sharing. It is possible that a tribe or a society that was always threatened may have a surplus of psychopaths as they are constantly in a fight or flight survival mode thus their culture might be all about revenge (anger) and being victimized (fear). Then the response would be storage of necessities (food, wealth, land, sanctuaries, law, justice, etc.) as a defensive measure.
The intelligent psychopaths would do anything to gather wealth (white collar crime via banks) while the less intelligent psychopaths may go into crime to steal wealth (blue collar). It is very possible that psychopaths would not obey moral codes as the codes are meant for the society as a whole and meaningless to someone who has no empathy for others.