I don't understand the point of this post. I mean, I understand its points, but why is this post here? Is it trying to point out that: (a) intent and reality are not always -- and usually aren't -- entangled? (b) Reality happened and our little XML-style purpose tags are added post fact?

It seems odd to spend so much time saying, "Humans reproduced successfully. Anger exists in humans." If the anger part is correlated to the reproduction part it seems fair to ask, "Why did anger help reproduction?" This is a different question than, "What is the purpose of anger?" Is this difference what the article was pointing out?

To reason correctly about evolutionary psychology you must simultaneously consider many complicated abstract facts that are strongly related yet importantly distinct, without a single mixup or conflation.

How is this different from any other topic?

To reason correctly about computer science you must simultaneously consider many complicated abstract facts that are strongly related yet importantly distinct, without a single mixup or conflation.

To reason correctly about Starcraft II you must simultaneously consider many complicated abstract facts that are strongly related yet importantly distinct, without a single mixup or conflation.

The idea of special-casing evolutionary psychology is where I feel I am losing the plot.