First let me say that, though I disagree with your ontology entirely, I have very much enjoyed our discussion so far.
When I say random, I mean random in the sense of chaos theory:
"Systems that exhibit mathematical chaos are deterministic and thus orderly in some sense; this technical use of the word chaos is at odds with common parlance, which suggests complete disorder. See the article on chaos for a discussion of the origin of the word in mythology, and other uses. When we say that chaos theory studies deterministic systems, it is necessary to mention a related field of physics called quantum chaos theory that studies non-deterministic systems following the laws of quantum mechanics." (from Wiki)
You write: "cultural evolution requires on behalf of its agents a learned understanding, at least on some intuitive level, of the nature of humanity."
I would dispute this with the example of elephants and apes, and the phenomenon of elephant and ape culture (likewise for dolphins). And I dispute pegging cultural evolution to the ethical. I peg it to organizational fitness, which is, of course, a survival value.
I think our ontology is simply incompatible. For me, ethics are purely representational of and contingent on survival behaviors. The first survival behavior we should concern ourselves with is that which led apes to form groups, and I define this behavior as the semi-rational desire to survive and not die violently (and on my blog I speak about the visual experience of empathy as being a primary mover in this regard). Once this happened, the formation into groups, the further evolution of the brain, the evolution of walking, opposable thumbs, etc. all created new dynamics in the group that led to new learned behaviors.
The group, which was dependent upon its members' behavior, was held together by the punitive dominance of the leader, or perhaps an oligarchy of elders. It was the threat, and occasional example, of corporeal punishment that kept behaviors in line, much as it does in the animal kingdom in all kinds of group dynamics.
The properties of the group, its goals, and its collective knowledge determined the type of ethical behavior that allowed it to survive and advance. For instance, once humans stopped living from hand to mouth, and started farming, the organizational structure of the group changed, different needs developed, and behaviors that were beneficial adapted.
As an example, concept of "stealing" probably began with the idea of possessing women and territory. Within the group the ethic of "not stealing" was enforced by the dominant male, and any group member who stepped over the line was punished in short order. The male that kept the tightest ship, who exercised his power most consistently so as to be predictable as a punisher, had better organizational success and therefore a higher survival value. It is important to note that his punitive actions were not derived from high-minded ethical abstraction, or from rational choice, but from the selfish feelings of possession and the jealously of power found in almost all animal males.
In another example, "telling the truth" was probably a response to the paucity of accurate information in ancient civilizations, with accurate information itself having a survival value. Inaccurate information, occasionally, would have drastic and dire consequences for the group, so it also was proscribed and deterred by this emerging ethic.
Fundamentally, these ethical behaviors evolved because order and survival were, and are, closely linked. Ethical concepts, therefore, are simply post-phenomenon representations of evolutionarily advantageous behavior. Codifying these ethics facilitated communication of norms, but the concepts came from experience, not the other way around.
I firmly believe that the group evolved, not from rational choices, but from the pre-language primate's desire to survive and not die violently. The success of the group in pursuing this goal would have been immediately apparent, even if none of the members could explain why the group dynamic was so benefical. These behaviors were then taught to the young, and they taught their young, and so on until language came around to supplement learning-by-example. And that is the advent of linquistic based ethical concepts.
(As an aside, love is a chemical state and can manifest in many ways outside the ethical. Resentment is the same, and these phenomena are found in other primates.)
If treated as survival traits, ethical behavior becomes no more mysterious than the tooth or the claw of the tiger. Without these survival tools, the tiger would not be around to study; likewise with ethics and man.
Because of this evolutionary paradigm, there was never any necessity in the rise of man. We are successful simply because our distinctiveness helped us to survive better than all other animals. Our distinctive mental and linquistic abilities, our distinctive posture and distinctive hands, and the distinctive accidents of memetic creation allowed our preeminence.
And that last sentence of the previous post was my attempt at a joke. It would take much more than a friendly debate to change my mind on these core beliefs.
I think you err in correlating my evolutionary understanding of society with idolizing it. If anything, the evolutionary paradigm diminishes society by diminishing its inevitability and necessity. I do agree that we are more free now than ever before and that history has had a visible direction towards liberty, but you must see that this may not always be the case. If the conceptual paradigm that humans have built for themselves runs into an unkind and incompatible reality, the whole thing could come crashing down.
Be careful not to idolize it to much, yourself.