In a state of nature, without society, all people have only natural freedom. Each may do as he pleases, restricted only by physical limitations and natural consequences. An individual does not have the natural freedom to do that which he is physically incapable of doing. One may annoy a grizzly; however, natural consequences will dictate that he will then become the bear’s lunch.
Individual human beings, however, are not particularly fit animals. Our musculature is weak and our natural armament (teeth and nails) poor. To survive and prosper, we must organize ourselves into societies: groups of people acting cooperatively to leverage our superior intelligence and memory. To cooperate, the members of a society must define and hold an ideology: a set of ideas held in common that further the cooperative effort of the group.
To qualify as an societal ideology, it must be held by all members of the society; to participate in the society, even a dissenter must exhibit at hypocritical adherence to its ideology. Of course there are ideas not held in common by all the members of a society; those ideas are by definition not part of that society’s ideology.
We can categorize an individual idea of an ideology by its effect on a natural freedom. An idea may either deny, protect or compel the expression of a natural freedom. We can assign certain words to categorize these ideas. An idea may define a protected freedom, one which an individual may not compel another to forego. An idea may define a right, which allows an individual to compel another to forgo a natural freedom. An idea may define a compulsion, which compels an individual to perform a certain action. An idea may be universal, applying to all members in a society, or it may define a privilege (lit. “private law”) applying only to certain indivuals, either specifically or to members of a sub-group.
Weight of numbers enforces the provisions of an ideology. In a primitive society, the dissenter is killed or exiled by the members themselves. In a more sophisticated society, correction or elimination of the dissenter is relegated to specialists (e.g. police, lawyers, judges, etc.). The ideology often places special compulsions and restrictions on the actions of these individuals and differentially protects certain freedoms.
In a primitive society, the ideology is informal, held in the minds of the individuals. In a more sophisticated society, the ideology is codified into a set of laws.
Societies evolve much as species evolve, through mutation and natural selection. Societies evolve must faster than do species, because ideas can propagate and “reproduce” faster than can genes. Early societies had very primitive ideologies, e.g. do what the big guy says. Since communication and ideological instability limit the size of a cooperative group, multiple societies will coexist. Since reproduction will increase the size of the overall population, individuals within a society and societies in physical proximity will compete for limited resources. Those societies that are most efficient at obtaining, creating and defending their resources will persist, those that are least efficient will perish.
On an emprical level, we have no basis for calling an ideology successful except my measuring its survivability. We can make empirical generalizations (political, sociological, and/or anthropolocial theories) by observing common ideas of past and present societal ideologies. The empirical study of ethics essentially attempts to discover what aspect of ideology enable or impair societal survival. Essentialy, such a paradigm defines an idea that contributes to societal survival as ethical and an idea that endangers or impairs survival as unethical.