I think that morality in the real world is a set of behaviors that made it easier for our ancestors to get along with the group, thus increasing their mating pool and offspring survival rates. Dunbar's number explains why it is so easy for us to espouse ideals like thou shalt not kill within the group and then justify the killing of other groups to take their resources and women. Intuitive morality is a function of what was most effective in a tribal environment.