I should have made it more clear in the post that the primary target of the post was not professional, academic evolutionary psychology. Rather, I was primarily cautioning amateurs (such as LW regulars) about some of the caveats involved in evpsych and noting the rigor required for good theories. While the post does also serve as a warning to be cautious about sloppy research (or sloppy science journalism) that doesn't seem to be taking these issues into account, I don't question the claim that the people doing serious evpsych are aware of all the issues I mentioned, and are probably taking them into account.

Could you give an example of someone making this error?

My wording was probably a bit too strong. Anyway, I'll try to look up some examples once I wake up.

Ah, but why do women have less strength, and men have more? See the excerpts from David Geary's Male, Female here arguing that greater male strength is related to sexual selection. (The mere fact that females have the babies isn't enough, because many monogamous primates exhibit minimal dimorphism.)

We know that there were different selection pressures on men and women. It doesn't make sense to believe that these selection pressures were strong enough to change body morphology, but somehow had no effect on psychology and behavior. That would be "neck-down Darwinism."

Huh. This is an excellent point; I'm now updating in favor of an increased probability for mental sex differences.

I think your post could use a couple citations for this claim. Off the top of my head, this claim may be true for some traits, but I've also seen evidence that it is false for others.

I was thinking of a study mentioned in one of Buss' textbooks, which I unfortunately don't have at hand right now. I will look up the exact citation.

So, just because we see a certain sort of variation, it doesn't necessarily strike down the hypothesis of universal, or quasi-universal, evolved human predispositions.

Right. I should have been clearer on this, too. I did not mean to argue that the variation would disprove an evolutionary or biological basis for these traits. Instead, I was using it as a caution against making too many assumptions of specific individuals.

It may have been a bit misplaced in this post, as it's more of a general caveat about psychological research than a criticism of evpsych in particular: not many results in psychology are truly universal in that you couldn't find individuals who were counterexamples. I should possibly remove it and make it into its own post.