Harris vs. Craig at Notre Dame

Last night I was well-filled with cheap pizza and pricey booze, and much like the Biblical character Boaz on the threshing floor, perhaps not in the best possible condition to make a dispassionate and rational assessment of the situation. With that caveat out of the way, I have to say that I thought Sam Harris pretty much held his own against William Lane Craig last night. I'll put up a more detailed review whenever I find an mp3 copy, but here are my first impressions for now.

Openings

Craig makes the argument that morality must be objective, not in the usual sense of the term, but rather in the sense of being universally binding upon all persons on account of what he calls a "Competent Authority" by which he means the God of Abraham, Moses, and Jesus. Here is the argument in deductive form:

1. Objective morality requires moral rules laid down by God.

2. Objective morality, in this sense, really does exist.

3. Therefore, God exists.

The argument is deductively valid, but both of the premises are evidently false. Craig's argument for the first premise is essentially that morality can only be understood as a set of rules laid down by an authority figure. He begs the question really hard here, but he does it with the flair of a showman and the conviction of a true believer. Craig's argument for the second premise relies on the audience not noticing when Craig makes the subtle shift from the almost universal moral outrage at the examples he provides to the idea the we cannot be properly outraged unless God is as well. Okay, well it doesn't sound at all subtle when I put it that way, but I promise he does is smoothly.

Harris, for his part, tries to make the case that we should not think of morality as binding rules handed down from above, but rather as a set of ideas derived from our best scientific understanding of how to bring about the flourishing (and avoid the suffering) of conscious and sentient creatures such as ourselves. He makes a strong analogy with the field of medicine and the idea of health versus illness. We assume that health is better for everyone, then we use science to derive ideas about how to get there, e.g. stop smoking, do your cardio, eat your vegetables, wear your rubbers, etc.

If you want a better sense of Harris' opening statement and basic arguments, you can have a look at this video or others like it, in which he stakes out his position and unpacks a sort of simplified utilitarianism for the 21st century.

Rebuttals

During the rebuttals, I noticed that Craig retreated a bit further into philosopher mode, in which he seems to assume that everyone in the audience is taking an undergraduate degree in philosophy and can understand what he is saying even when he doesn't bother define his terms. Meanwhile, Harris stuck with plain language, powerful analogies, and memorable one liners. He also takes a direct shot or two at Catholicism at Notre Dame. He falls short just a bit, though, when he failed to make it perfectly clear that this debate ultimately consists of a sematical struggle over what it means to act morally. The entire debate can be summed up thusly:

WLC: Morality consists in following rules issued from above

SH: No, morality consists in helping people because we happen to like people.

WLC: No, no no, it is all about binding rules from a Competent Authority.

SH: There is no such Authority, and have your read those rules? They are God awful.

WLC: OBEY GOD'S RULES!

SH: HELP OTHER PEOPLE!

And so forth. Basically, it comes down to the question of whether we are morally motivated by fear of God or by the love of people, and I have trouble believing that anyone showed up to the debate truly agnostic on this issue, because one has to settle the question of whether any gods exist before you can really get on with the moral arguments. I agree with John Loftus that the best anyone can do against Craig is break even, but I have to give Sam Harris major props for very nearly doing so, especially on a topic like morality, where both our language and our intuitions are strongly biased towards a dualistic and theistic understanding.

Ayala vs. Craig at Indiana University

Luckily enough, I spent a memorable fraction of my early childhood in my Puerto Rican grandparent’s home, which means that I’m somewhat used to hearing English spoken with a strong Spanish accent. That said, I’m guessing that many people will find Dr. Ayala hard to follow on account of his accent, and that despite the relatively high quality of the audio recording.

Ayala leads off by drawing a distinction between designed artifacts and non-designed objects. He notes that organisms were left out of the original scientific revolution (which posited that the rules of nature are universal) because of the kind of thinking put forth by Paley and other intelligent design theorists. Ayala claims that Darwin’s great advance was to show how purposeful complexity may arise naturally, thus bringing life finally within the penumbra of a scientific revolution which had begun much earlier. He goes on to adduce several common evidences of evolution by natural selection operating over geological time. Ayala believes (as I do) that the most convincing evidence for common descent is that we find from a branch of sciences unavailable to Darwin’s contemporaries, that is, the evidence of molecular biology.

Craig leads off by defining intelligent design as a set of theories for inferring design from evidence. He briefly alludes to Bill Dembski’s argument from highly improbable complex patterns, and argues that the inference to design is justified on those grounds alone. Craig does not contest common descent (for which Ayala had argued) focuses his efforts entirely on the mechanisms of random mutation and natural selection. He makes an interesting argument that studies of the HIV genotype over a couple decades can give us any idea of what mutation is capable of producing over a time span very many orders of magnitude longer. He also argues that evolutionists must show definitively that mutation plus natural selection is powerful enough to get everything done in only a few billion years.

Ayala, on rebuttal, seems at first to ignore Craig’s opening statement, but he is actually trying to give an example of the power of mutation and selection in practice. He refers to a test tube experiment in which low-probability mutations can be made to take over an entire tube merely by changing the environment in which the bacteria breed. He then goes on to reiterate some of the evidence for common descent.

Craig picks apart Ayala’s opening statement and rebuttal, quote-mining from various fringe scientists to show that mutation plus selection doesn’t drive the creation of new biological mechanisms in under a hundred years or two. Funnily enough, Craig accuses his opponent of undue extrapolation, even as he stretches timelines from 10^2 to 10^9 in attempt to show that Darwinian mechanisms just cannot get the job done in the time available. Craig seems to conclude that while the universe is impressively fine-tuned for intelligent life, it is not fine-tuned enough to expect intelligent life to arise more than once.

Overall impressions
This debate demonstrates amply that expertise in public debating and debate prep can overcome expertise in the topic under debate. Ayala clearly knows more about the subject matter, but he seems overwhelmed by Craig's relentless focus on the problem of how often mutations arise within a given population. I'd be interested in hearing a debate focused on that paritcular issue, but to my knowledge that's never been done.