We already know that a political dichotomy is game-theoretically mandated by the U.S. voting system. Which means we don't particularly need a separate and additional explanation for political dichotomies, and so I'd want independent evidence of other explanations.
and the two moods must serve some sort of evolutionary function, right?
Maybe depression is like the appendix, or a congenital skin rash, or food allergies, or male nipples, or the optic nerve being in backwards, or ingrown toenails, or the coccyx. In other words, sometimes evolution is just stupid.
Maybe depression is like the appendix, or a congenital skin rash, or food allergies, or male nipples, or the optic nerve being in backwards, or ingrown toenails, or the coccyx.
The implication being that the coccyx is useless? How so?
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.