Honest disagreement is often a good sign of progress.
- Gandhi
Now that most communication is remote rather than face-to-face, people are comfortable disagreeing more often. How, then, can we disagree well? If the goal is intellectual progress, those who disagree should aim not for name-calling but for honest counterargument.
To be more specific, we might use a disagreement hierarchy. Below is the hierarchy proposed by Paul Graham (with DH7 added by Black Belt Bayesian).1
DH0: Name-Calling. The lowest form of disagreement, this ranges from "u r fag!!!" to "He’s just a troll" to "The author is a self-important dilettante."
DH1: Ad Hominem. An ad hominem ('against the man') argument won’t refute the original claim, but it might at least be relevant. If a senator says we should raise the salary of senators, you might reply: "Of course he’d say that; he’s a senator." That might be relevant, but it doesn’t refute the original claim: "If there’s something wrong with the senator’s argument, you should say what it is; and if there isn’t, what difference does it make that he’s a senator?"
DH2: Responding to Tone. At this level we actually respond to the writing rather than the writer, but we're responding to tone rather than substance. For example: "It’s terrible how flippantly the author dimisses theology."
DH3: Contradiction. Graham writes: "In this stage we finally get responses to what was said, rather than how or by whom. The lowest form of response to an argument is simply to state the opposing case, with little or no supporting evidence." For example: "It’s terrible how flippantly the author dismisses theology. Theology is a legitimate inquiry into truth."
DH4: Counterargument. Finally, a form of disagreement that might persuade! Counterargument is "contradiction plus reasoning and/or evidence." Still, counterargument is often directed at a minor point, or turns out to be an example of two people talking past each other, as in the parable about a tree falling in the forest.
DH5: Refutation. In refutation, you quote (or paraphrase) a precise claim or argument by the author and explain why the claim is false, or why the argument doesn’t work. With refutation, you're sure to engage exactly what the author said, and offer a direct counterargument with evidence and reason.
DH6: Refuting the Central Point. Graham writes: "The force of a refutation depends on what you refute. The most powerful form of disagreement is to refute someone’s central point." A refutation of the central point may look like this: "The author’s central point appears to be X. For example, he writes 'blah blah blah.' He also writes 'blah blah.' But this is wrong, because (1) argument one, (2) argument two, and (3) argument three."
DH7: Improve the Argument, then Refute Its Central Point. Black Belt Bayesian writes: "If you’re interested in being on the right side of disputes, you will refute your opponents' arguments. But if you're interested in producing truth, you will fix your opponents' arguments for them. To win, you must fight not only the creature you encounter; you [also] must fight the most horrible thing that can be constructed from its corpse."2 Also see: The Least Convenient Possible World.
Having names for biases and fallacies can help us notice and correct them, and having labels for different kinds of disagreement can help us zoom in on the parts of a disagreement that matter.
Let me illustrate by labeling excerpts from Alvin Plantinga's critical review of Richard Dawkins' The God Delusion.
DH1, Ad Hominem:
Dawkins is not a philosopher... [and] you might say that some of his forays into philosophy are at best sophomoric, but that would be unfair to sophomores...
DH2, Responding to Tone:
[In this book] the proportion of insult, ridicule, mockery, spleen, and vitriol is astounding. (Could it be that his mother, while carrying him, was frightened by an Anglican clergyman on the rampage?) If Dawkins ever gets tired of his day job, a promising future awaits him as a writer of political attack ads.
DH4, Counterargument:
What is Dawkins' reply [to the fine-tuning argument]? He appeals to 'the anthropic principle,' the thought that... "we could only be discussing the question in the kind of universe that was capable of producing us." ...But how does that so much as begin to explain why [our universe] is fine-tuned? One can't explain this by pointing out that we are indeed here — anymore than I can 'explain' the fact that God decided to create me (instead of passing me over in favor of someone else) by pointing out that if God had not thus decided, I wouldn't be here to raise that question.
DH6, Refuting the Central Point:
Chapter 3, 'Why There Almost Certainly is No God,' is the heart of the book... [Dawkins says] the existence of God is monumentally improbable... So why does he think theism is enormously improbable? The answer: if there were such a person as God, he would have to be enormously complex, and the more complex something is, the less probable it is: "However statistically improbable the entity you seek to explain by invoking a designer, the designer himself has got to be at least as improbable..."
...What can be said for this argument? Not much. First, is God complex? According to much classical theology... God is simple, and simple in a very strong sense... More remarkable, perhaps, is that according to Dawkins' own definition of complexity, God is not complex. According to [Dawkins] something is complex if it has parts that are "arranged in a way that is unlikely to have arisen by chance alone." But of course God is a spirit, not a material object at all, and hence has no parts. Therefore, given the definition of complexity Dawkins himself proposes, God is not complex.3
Of course, even a DH6 or DH7 disagreement can still be wrong. But at the very least, these labels can help us highlight the parts of a disagreement that matter for getting at the truth.
Also see: Causes of Disagreements.
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1 This article is an update to my earlier post on CSA.
2 Sometimes the term "steel man" is used to refer to a position's or argument's improved form. A straw man is a misrepresentation of someone's position or argument that is easy to defeat: a "steel man" is an improvement of someone's position or argument that is harder to defeat than their originally stated position or argument.
3 For an example of DH7 in action, see Wielenberg (2009). Wielenberg, an atheist, tries to fix the deficiencies of Dawkins' central argument for atheism, and then shows that even this improved argument does not succeed.
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I would add that the goal of intellectual progress sometimes extends beyond you-the-rationalist, to the (potentially less than rational) person you're arguing with. The goal is not just to "produce" the truth, or to recognize the truth with your own two eyes. The goal is to both locate the truth and convince the other person that it is in fact the truth.
Often, I find myself in the following scenario: Someone says, "X and Y, therefore Z!" And off the bat, I have a good idea of what they're thinking and where the logic goes bad. But in point of fact, they are being loose with semantics, and there exist definitions of X and Y consistent with their original (loose) statements which would imply Z. I could ask them clarifying questions and get them to pin down their position further...but alternatively, I am free to say, "Surely you don't mean this one thing [which they really do mean] because here's how that would go bad. Perhaps you really meant this other thing? Am I understanding you correctly?"
This makes it much easier for people to "back down" from their original position without losing face, because they are framed as not having ever committed to that position in the first place. The reality is that we often have a choice between nailing someone in place and offering them up as a sacrifice to the logic gods -- in which case we don't really win since the logic gods can't actually touch people who don't submit to their power -- or deliberately leaving them untethered, so that they will more willingly adjust to new evidence.
Here it's not so much that I'm constructing the best argument from the corpse of their fully formed argument and striking it down. It's more like encouraging the growth of an adolescent argument in a direction that does not require it to be struck down, in the process striking down the bad argument that the original argument would have grown into, and trying to ensure that my "opponent" doesn't end up getting slain along with the bad argument.
This would be out of place in the above post, but I thought it was worthy of a discussion on Better Disagreement. Because I used to think the way to win was to pin people into logical corners, but if you're goal is partly to convince people, and those people are like most people, then in my (limited) experience, this way works So. Much. Better.
I find this is the most constructive way to resolve a debate between two people (see: http://lesswrong.com/lw/881/the_pleasures_of_rationality/) But in long-running debates, or ones with heated debaters, this is much harder. Firstly, because many debates are long running precisely because this strategy cannot be applied to the,. The issue with heated debaters is that this requires an open mindset of looking for truth versus looking to prove yourself right, which I find lacking in many debates.