If you were able to provide ONE example of an ORDERLY society of human beings that believe it is right to go around lying, stealing and killing one another, I wouldn't need to prove the obvious point that such a society cannot exist.
I already have provided examples of orderly societies that beileve these things. Nazi Germany was a
very orderly society, as were the societies of the ancient Romans and Aztecs. The Romans conquered and stole from the Goths (and other barbarian tribes) enslaved them, and even killed them in arenas for sport. You personally may disagree with this moral system, but to the ancient Romans this was all perfectly acceptable. C.S. Lewis is flat out wrong if he suggests that ALL people feel that lying stealing and killing is immoral.
Secondly, even if in your opinion these societies were not orderly, it doesn't matter. "Orderly" is subjective, and to the ancient Romans they considered their own society very orderly.
Third: Assuming
everyone wants an orderly society where everyone is equal and free and killing lying and stealing are all nonexistent, then C.S. Lewis has a stronger case--we can use logic to figure out how best to accomplish these objectives. But not everyone wants those things, not everyone shares those same goals. The Romans didn't want everyone to be equal and free, they wanted to be rich and powerful--they didn't share our altruism. So for the Romans what they did was perfectly acceptable and ethical to acheive these ends.
I believe I covered subjective ethical thought. If you believe my argument to be illogical then dismantle it.
Let's think about ethics for a moment. Why would someone believe it's wrong to steal food? Because, they might say, if we all stole what doesn't belong to us society would drift into chaos. Why don't we want society to be in chaos? Because if society was in chaos, I might have my food stolen from me. Why do we not want our food stolen from us? Because, I want to eat. Why do we want to eat? Because I want to live. Why do you want to live? Because........I just do.
This just one example, but as you can see at the very bottom foundation of all our morals are axioms like "I want to live" from which all our moral codes are derived. There is no logic or reason that answers
why we want to live....one simply feels that way. I doubt many people truly do not want to live...this desire to live is an axiom that almost everyone shares.
However where Lewis goes wrong is that he doesn't realize that many more axioms are not shared, such as the emotional revulsion to murder. Many groups do not have the axiom "it is wrong to murder" (check my examples) and therefore an objective logical system of ethics based on the axiom "it is wrong to murder" is impossible, since this axiom varies in mankind. In fact, even people who do share the axiom "it is wrong to murder" might conflict on other axioms (such as "it is right to execute criminals") and therefore derail any universal system of ethics that everyone can agree on.
Lewis was on the right track though...
once we have established our moral axioms we can use logic and objective reason to figure out how to best acheive an axiom without compromising others. The problem is that different individuals and groups have conflicting sets of moral axioms, which no one single system of ethics can reconcile.