I mentioned before that those who are obsessed by IQ often, ironically, display poor logic in framing their arguments. One can quibble about precisely what IQ actually measures, it may or may not be a good measure of overall intelligence but few dispute that it is a reasonably good marker of one's facility with logic. Over at Gene Expression, the pseudonymous blogger Godless Capitalist provides a good example of the type of thing I mean, in referring to "the climate of fear in academia" that applies to "race (sur)realists" such as he, i.e. those who seek to categorise all of humanity into a handful of "races" and for whom pretty much any phenomenon is best explainable by race.
What he imagines is his killer argument is the admission by some researchers that they are reluctant to research a "gene for violence" because they are afraid that there will be a racial correlation. "You see," he invites us to infer, "even these guys think there will be a racial correlation. That means there must be."
It is easy to demonstrate that this is no argument at all: Imagine any contestable proposition. It doesn't really matter what it is, let's say it is proposition X:
"That gulwags are squiddles"
Now let's divide everybody (or at least everybody acquainted with gulwags and squiddles) into two sets. Set A consists of people who think X is probably true and Set B consists of people think X is probably untrue. Now, set A contains two subsets:
Subset A1: Those who think X is probably true and are happy or indifferent that it is true
Subset A2: Those who think X is probably true but don't want it to be true.
It is unremarkable to produce someone from subset A2 and in itself it proves nothing. For any proposition they are bound to exist. In the set of football fans who hold "that Manchester United will probably win the league next year" there is bound to be a subset of fans who don't want that to be true. This doesn't in itself prove that Manchester United will win the league.
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