Discussing the Evolutionary Debunking Argument 7 May 2011 John Danaher at Philosophical Disquisitions has a blog anyone with an interest in philosophy should be subscribing to. John presents simple argument diagrams and clear analyses of philosophy papers, usually those that deal with philosophy of religion and related topics. Recently he has been discussing an argument by Guy Kahane of Oxford that evolutionary debunking arguments (EDAs) in ethics are problematic. I suggested that I’d like to read his critique of an EDA argument presented by Paul Griffiths and myself, and he has obliged. Here are the relevant links: On Evolutionary Debunking Arguments (Part One) On Evolutionary Debunking Arguments (Part Two) On Evolutionary Debunking Arguments (Part Three) Griffiths and Wilkins on Evolutionary Debunking Arguments (Part One) Griffiths and Wilkins on Evolutionary Debunking Arguments (Part Two) Paul E. Griffiths and John S. Wilkins When Do Evolutionary Explanations of Belief Debunk Belief? I will reply on John’s blog when I get time. Epistemology Evolution Philosophy Science EvolutionPhilosophy
Education Visualising the molecular 28 Mar 2009 A dozen or so years ago, or maybe more, I was heading up the communications section of The Walter and Eliza Hall Institute of Medical Research in Melbourne, when I employed a young biology graduate as a graphics guy to do medical graphics. This he did for a while, until… Read More
History Aristotle on politics and religion 16 Feb 2010 “And further he [the tyrant] must be seen always to be exceptionally zealous as regards religious observances (for people are less afraid of suffering any illegal treatment from men of this sort, if they think that their ruler has religious scruples and pays regard to the gods, and also they… Read More
Evolution Dinosaur books! 26 Jun 2010 Greg Paul does some marvellous illustrations of dinosaurs and contemporary organisms, but they are usually only in magazines. Colour publishing being what it is, they are not collected in a quality book, but new technologies mean quality colour books can be printed on demand. So he announced this on the… Read More
Meh. I am in the middle of trying to sort out Gerald of Wales attempted debunking of Jocelyn of Furness’s claim that St Patrick drove all snakes and venomous creatures out of Ireland. Gerald is playing the “historical truth” card and looking to natural history and observation, but his motives seem more complex. This will get me utterly sidetracked and take some time to translate. Looks rather interesting!
An EDA is a special case of an NDA (naturalistic debunking argument), and the structure is this: P1: Claim A relies upon an exclusively non-natural explanation P2: There is a natural explanation for belief in A P3: When a natural explanation and a nonnatural explanation compete, it is more parsimonious to accept the natural C: The non-natural explanation is debunked [Note: not disproven, just undermined] If Gerald is giving a natural explanation for that which Jocelyn explains non-naturally, then he has undermined Jocelyn’s explanation. But the nonnatural explanation may yet be true; it is just that it is an unwarranted belief. This is quite distinct from what role the nonnatural belief plays, why it is important, and so on, which are a higher-level issue.
I’m not entirely happy with this way of getting at the kernel of the argument. Setting aside the fact that the truth of P3 will be highly sensitive to what is meant by saying that something is natural or nonnatural, which arguably can’t be taken for granted for large-scale domains like ethics, it seems a very large step from “It is more parsimonious to accept explanation E1 than to accept explanation E2” to “E2 is debunked” or “Claims based exclusively on E2 are unwarranted” This doesn’t seem to be at all a safe and reliable inference when it comes to parsimony because (1) parsimony is not the only factor to be weighed in determining whether a belief or explanation is warranted; and (2) parsimony admits of different, and not always consistent, measures. Do you really think it plays such a key role in the structure of these kinds of debunking arguments?
“If Gerald is giving a natural explanation for that which Jocelyn explains non-naturally, then he has undermined Jocelyn’s explanation.” Bradon’s point on P3 seems to be in play as Gerald has to take spontaneous generation as a factor at work when reaching his conclusion. But that just makes it more interesting rather than posing any major issues as these can be resolved small scale, case by case. This one runs surprisingly late well into the 20th century although the higher-level issue relating to belief are subject to considerable movement. The philosophical argument at the end of the day should be testable with enough individual case studies running with the issues. I suspect.
I’ve now added a discussion of Joshua Thurow’s paper on cognitive science and religious belief in case anyone’s interested. Here’s a link to all posts in the series: Evolutionary Debunking Arguments (Index)