There’s been a good deal of debate on this blog about whether it’s appropriate to look at the motives of people who are making particular arguments (for example Lomborg and the environment), or whether you should take them at face value and respond to the arguments directly. Much the same debate has been taking place among US econobloggers, including Brad de Long and Arnold Kling. You can get started with Brad here.
My view is that motives matter. It’s very difficult to conduct a reasoned discussion with someone if you know they will lie, or distort the truth, whenever they get away with it. Hence, it’s important to distinguish between honest disagreement and propaganda and necessary to respond differently to one than to the other.
Update This post from Tim Lambert illustrates the point perfectly. It concerns an article by well-known pro-gun academic John Lott purporting to prove the correctness of some claims made by rightwing windbag Rush Limbaugh about media coverage of black quarterbacks in the NFL. As Lambert says
Even if all the data is correct and his regressions have been correctly calculated his analysis is not in the slightest bit persuasive. The reason is that his behaviour in the coding errors case suggests that he just keeps trying different models and just cherry picks the one that gives the result he wants. Would Lott want to get a result that supports Limbaugh? Well, check out this Mary Rosh posting:
You have got to download this paper. Lott has done an amazing piece here. Fits in perfectly with Rush Limbaughâs program today.
Tim’s site has more on the Lott/Rosh saga and the bizarre parallels with the case of antigun researcher Michael Bellisles. Ted Barlow at Crooked Timber has more on this (warning: Turn irony detectors on full before reading this post). Finally, for more on the problem of cherry-picking, aka “data mining”, read here, here and here. To spell it out, statistical results from someone you can trust to play by the rules are worth discussing, those from someone known to engage in data-mining/cherry-picking are not.