I think the study of psychopathy historically was seen as a branch of criminal psychology and most cases studies of psychopaths are criminal psychopaths. I think if you combine a certain personality type with abuse then you get a criminal psychopath. Breivik on the other hand doesn't seem to have had much abuse as a child nor did he have any run ins with the law (as far as I am aware) - so he's not necessarily typical of the literature on the subject. Having said that I don't think he is a psychopath. He doesn't seem to be particularly dishonest or duplicitous or glib or controlling or manipulative. Just very, very cold and somewhat grandiose.