Every once in a while you get stories like this one, about the underrepresentation of conservatives in academics, that treat ideological divides as being somehow equivalent to racial differences. This is a really, really bad analogy.

And it’s not just the fact that you can choose your ideology, but not your race. Ideologies have a real effect on overall life outlook, which has a direct impact on job choices. Military officers are much more conservative than the population at large; so? (And funny how you don’t see opinion pieces screaming “bias” and demanding an effort to redress the imbalance.)

It’s particularly troubling to apply some test of equal representation when you’re looking at academics who do research on the very subjects that define the political divide. Biologists, physicists, and chemists are all predominantly liberal; does this reflect discrimination, or the tendency of people who actually know science to reject a political tendency that denies climate change and is broadly hostile to the theory of evolution?

Now, I don’t mean to say that political bias in the academy is absent, although it’s not consistent: I can well imagine that it’s hard to be a conservative in some social sciences, but in economics, the obvious bias in things like acceptance of papers at major journals is towards, not against, a doctrinaire free-market view. But the point is that doing head counts is a terrible way to assess that bias.