What is an ad hominem fallacy?

As students of logic know, not every appeal to authority is a fallacious appeal to authority.  A fallacy is committed only when the purported authority appealed to either does not in fact possess expertise on the subject at hand, or can reasonably be supposed to be less than objective.  Hence if you believed that PCs are better than Macs entirely on the say-so of either your technophobic orthodontist or the local PC dealer who has some overstock to get rid of, you would be committing a fallacy of appeal to authority -- in the first case because your orthodontist, smart guy though he is, presumably hasn’t much knowledge of computers, in the second case because while the salesman might have such knowledge, there is reasonable doubt about whether he is giving you an unbiased opinion.  But if you believed that PCs are better than Macs because your computer science professor told you so, there would be no fallacy, because he presumably both has expertise on the matter and lacks any special reason to push PCs on you.  (That doesn’t necessarily mean he’d be correct, of course; an argument can be mistaken even if it is non-fallacious.)

Similarly, not every ad hominem attack -- an attack “against the man” or person -- involves a fallacious ad hominem.  “Attacking the man” can be entirely legitimate and sometimes even called for, even in an argumentative context, when it is precisely the man himself who is the problem.

Craig on theistic personalism

Someone posted the following clip at YouTube, in which William Lane Craig is asked about me and about his view of the dispute between classical theism and theistic personalism:

Aristotle on Method and Metaphysics

I am pleased to announce that Aristotle on Method and Metaphysics, an anthology I have edited for Palgrave Macmillan’s Philosophers in Depth series, will be out this August. 

Aristotle on Method and Metaphysics is a collection of new and cutting-edge essays by prominent Aristotle scholars and Aristotelian philosophers on themes in ontology, causation, modality, essentialism, the metaphysics of life, natural theology, and scientific and philosophical methodology.  Though grounded in careful exegesis of Aristotle's writings, the volume aims to demonstrate the continuing relevance of Aristotelian ideas to contemporary philosophical debate.

Philosophy on radio

The other day I was interviewed by Frank Turek for his show CrossExamined.  The show will be broadcast tomorrow, Saturday April 6, at 10-11 am Eastern time.  The podcast is also available at the American Family Radio website.  Among the topics discussed is the argument from motion for an Unmoved Mover.  (Frank had to cut me off at one point because I couldn’t hear the bumper music that would have alerted me that it was time to shut up!)

Reply to Kozinski

I’ve been meaning to write up a response to Thaddeus Kozinski’s post at Ethika Politika criticizing my recent piece on David Bentley Hart’s views about natural law.  Brandon Watson has already pointed out some of the problems with Kozinski’s article, but it’s worth making a few remarks.  Kozinski is the author of the important recent book The Political Problem of Religious Pluralism, and I have enjoyed the articles of his that I’ve read over the years.  However, this latest piece seems to me to manifest some of the foibles of too much post-Scholastic theology -- in particular, a tendency to conflate a view’s no longer being current with its having been proved wrong; a failure to make crucial conceptual distinctions; and a tendency to caricature the views of writers of a Scholastic bent.

Nagel and his critics, Part VIII

Resuming our series on the serious critics of Thomas Nagel’s Mind and Cosmos, let’s turn to Simon Blackburn’s review in New Statesman from a few months back.  Blackburn’s review is negative, but it is not polemical; on the contrary, he allows that the book is “beautifully lucid, civilised, modest in tone and courageous in its scope” and even that there is “charm” to it.  Despite the review’s now somewhat notorious closing paragraph (more on which below) I think Blackburn is trying to be fair to Nagel.

Rosenhouse keeps digging

Here’s a conversation that might occur between grown-ups:

Grown-up #1: I haven’t read Nagel’s book or much of the positive commentary on it, but based on what I’ve seen in the popular press it all seems like a lot of absurd intellectual silliness based on caricature and sheer assertion.

Grown-up #2: Jeez, don’t you think you ought to read it before making such sweeping remarks?  You’re hardly going to get a good sense of the content of a set of complex philosophical arguments from a couple of journalistic pieces!

Grown-up #1: Yeah, I guess so.  Fair enough.

And here’s a conversation between a grown-up and Jason Rosenhouse:

EvolutionBlog needs better Nagel critics

EvolutionBlog’s Jason Rosenhouse tells us in a recent post that he hasn’t read philosopher Thomas Nagel’s Mind and Cosmos.  And it seems obvious enough from his remarks that he also hasn’t read the commentary of any of the professional philosophers and theologians who have written about Nagel sympathetically -- such as my own series of posts on Nagel and his critics, or Bill Vallicella’s, or Alvin Plantinga’s review of Nagel, or Alva Noë’s, or John Haldane’s, or William Carroll’s, or J. P. Moreland’s.  What he has read is a critical review of Nagel’s book written by a non-philosopher, and a couple of sympathetic journalistic pieces about Nagel and some of his defenders.  And on that basis he concludes that “Nagel needs better defenders.”

Nagel and his critics, Part VII

Let’s return to our look at the critics of Thomas Nagel’s Mind and Cosmos.  New commentary on Nagel’s book continues to appear, and to some extent it repeats points made by earlier reviewers I’ve already responded to.  Here I want to say something about Mohan Matthen’s review in The Philosophers Magazine.  In particular, I want to address what Matthen says about the issue of whether conscious awareness could arise in a purely material cosmos.  (Matthen has also commented on Nagel’s book over at the New APPS blog, e.g. here.)

Review of Kurzweil

My review of Ray Kurzweil’s recent book How to Create a Mind: The Secret of Human Thought Revealed appears in the April 2013 issue of First Things. 

Ferguson on Nagel

In the cover story of the current issue of The Weekly Standard, Andrew Ferguson reviews the controversy generated by Thomas Nagel’s Mind and Cosmos.  Along the way, he kindly makes reference to what he calls my “dazzling six-part tour de force rebutting Nagel’s critics.”  For interested readers coming over from The Weekly Standard, here are some links to the articles to which Ferguson is referring, with brief descriptions of their contents.

Capital punishment lecture

This Friday, March 15, I’ll be speaking at California State University, San Bernardino on the topic “Is Capital Punishment Just?”  Details here.

(The short answer, as my longtime readers know, is “Yes.”  I’ve discussed the issue on the blog and elsewhere many times, such as here, here, here, here, here, here, and here.  But the talk on Friday will address some fundamental issues about the grounds of punishment in general that are not discussed in these earlier articles and posts.)

The whole man

My recent review of Michael Gazzaniga’s Who’s in Charge? Free Will and the Science of the Brain is now available online at the Claremont Review of Books website.  And while you’re on the subject of philosophical anthropology, you might also take a look at William Carroll’s recent Public Discourse article “Who Am I? The Building of Bionic Man.”

Spare not the Rod

David Bentley Hart’s First Things article on natural law, which I criticized a few days ago, got some positive responses elsewhere in the blogosphere.  One of its fans is Rod Dreher at The American Conservative, who wrote:

If you don’t believe there is any cosmic order undergirding the visible world, and if you don’t believe that you are obliged to harmonize your own behavior with that unseen order (the Tao, you might say), then why should you bind yourself to moral precepts you find disagreeable or uncongenial?  The most human act could be not to yield to nature, but to defy nature.  Why shouldn’t you?  Or, to look at it another way, why should we consider our own individual desires unnatural?  Does the man who sexually and emotionally desires union with another man defying [sic] nature?  Well, says Hart, it depends on what you consider nature to be.

Well, yes, it does.  This is news?  Who, exactly, are the natural law theorists who have ever denied this?

Philosophy on radio (UPDATED)

I’ll be appearing later today on Catholic Answers Live, at 4:00 pm (Pacific time).  Today’s show is billed as an “Open Forum for Atheists,” so have at it.  Links to some previous radio interviews can be found here.

UPDATE: The podcast of the show is now available here.

A Christian Hart, a Humean head

Note: The following article is cross-posted over at First Things.

In a piece in the March issue of First Things, David Bentley Hart suggests that the arguments of natural law theorists are bound to be ineffectual in the public square.  The reason is that such arguments mistakenly presuppose that there is sufficient conceptual common ground between natural law theorists and their opponents for fruitful moral debate to be possible.  In particular, they presuppose that “the moral meaning of nature should be perfectly evident to any properly reasoning mind, regardless of religious belief or cultural formation.”  In fact, Hart claims, there is no such common ground, insofar as “our concept of nature, in any age, is entirely dependent upon supernatural (or at least metaphysical) convictions.”  For Hart, it is only when we look at nature from a very specific religious and cultural perspective that we will see it the way natural law theorists need us to see it in order for their arguments to be compelling.  And since such a perspective on nature “must be received as an apocalyptic interruption of our ordinary explanations,” as a deliverance of special divine revelation rather than secular reason, it is inevitably one that not all parties to public debate are going to share.

Back from Lafayette

Back today from Lafayette, Louisiana, where I gave a talk (available for viewing via Vimeo -- or, alternatively, on YouTube) at Our Lady of Wisdom Church and Catholic Student Center, adjacent to the University of Louisiana at Lafayette.  I thank my host Fr. Bryce Sibley and the other folks at the Church and Center for their warm hospitality.  The fine group of guys you see above are some readers with whom Fr. Sibley and I had a nice evening of gumbo, whiskey, and philosophical and theological discussion.