Sure, balance is important. But if you look at Robin's closing paragraph, it is not calling for balance:

"Perhaps martial-art-style rationality makes sense for isolated survivalist Einsteins forced by humanity's vast stunning cluelessness to single-handedly block the coming robot rampage. But for those of us who respect the opinions of enough others to want to work with them to find truth, it makes more sense to design and field institutions which give each person better incentives to update a common consensus."

What I get from the metaphor is that practicing martial-arts style rationality is as useless to our lives as practicing physical martial arts. And that is horridly wrong.

Thanks for explaining your downvote, but don't apologize for it!