So, Brad DeLong posits a very simple model to refute the idea of natural selection within the last 10,000 years. But this doesn't work, models are context dependent. Evolutionary psychology can't work, except when it can. And so on.

Update: Just to make it clear, the point of the post was to show how plausible or implausible simple models become depending on where you stand on a given issue. As I've noted before, your political or social stance strongly colors the perceived utility of a model where many parameters are left explicitly unaccounted for.