This essay contains the essence of CS Lewis’ arguments in his fascinating short book The Abolition of Man/Humanity.
In the video, Lewis knocks down a weak strawman argument about subjectivism. He starts with a backstory about biological evolution. In his setup, he conflates empirical tautological truth with moral truth and paints them as equivalent.
Lewis introduces right and wrong and good and evil in order to provoke an emotional to realists and cognitivists, and attempts to underscore it with an appeal to tradition wrapped in an appeal to authority and positive ad hominem that ‘until modern times, no thinker of the first rank ever doubted that our judgments of value were rational judgments‘ [in situ].
Lewis notes that if one believes that morals are socially conditioned, then we could as soon have been conditioned differently, but he’s just trying to set up his next strawman, which is to say that some subjectivist, say, an educator or reformer, may ask us to improve our morality, and leads into his punchline, that subjectivism will surely ‘be the disease that will certainly end our species‘ [in situ]. I’ll ignore his eternal damnation quip as quaint.
He points out that some indignation toward the Third Reich (Godwin’s Law) is groundless, but what he continues to ignore is that this claim cannot be made on moral grounds. In fact, from the vantage of a Nazi at the time, they were doing the moral thing. Furthermore, had the Nazis won the war, this would be the prevailing morality.
Here Lewis tries to conjure an is from an ought by claiming that without ‘objective standards of good‘, then any ideology is as good as the next, and so he is simply tilting at windmills and arguing with this gossamer strawman. From this condition, he complains that one cannot measure better without an objective measure, so, therefore, there needs to be an objective measure. This, of course, is wishful thinking, like my complaining that I cannot win the lottery without winning the lottery, therefore, I must have won the lottery. (I accept payment by cash, cheque, or Bitcoin.)
In essence, the argument attempts to make a claim that a subjectivist wanting to make a moral claim of ‘better’ or ‘progress’ cannot because there is no ‘better’ or ‘progress’, these terms being subjective. The strawman here is that a subjectivist would make this claim on the basis of moral argumentation. As even Lewis notes, subjectivists claim value judgments as sentiments or complexes, so preferences. This is true; so the claim would be based on a preference rather than on a moral one.
He proclaims that the question ‘why should we preserve the [human] species?’ is somehow profound. It’s a valid question, but, again, it can be answered outside of the realm of morality—constructed or otherwise. Then he goes down some instincts rabbit hole based on this faulty premise but tries to circle back to his standby old universal moral law.
From the rabbit hole down a slippery slope down a rat hole, he rambles anecdotally. Tailing the vid with some supposed objective prescriptions, it mercifully ends.