Very interesting threads of thought in this essay. The idea of culture as an evolved complex, similar to an ecosystem in some ways and similar to an organism in others is a strong one.

Like an ecosystem, there is a certain equilibria that uses both rational and non rational elements to maintain. Some of the elements are downright irrational. There is a brilliant representation of this by Douglas Adams that I often quote. The whole thing is definitely worth a read if you enjoyed this essay. It is really a different way of looking at the same thing. I'll paste some pieces of it here:

..The one I have in mind at the moment is one that describes the culture and economy of Bali, which is a small, very crowded island that subsists on rice. Now, rice is an incredibly efficient food and you can grow an awful lot in a relatively small space, but it's hugely labour intensive and requires a lot of very, very precise co-operation amongst the people there, particularly when you have a large population on a small island needing to bring its harvest in. People now looking at the way in which rice agriculture works in Bali are rather puzzled by it because it is intensely religious. The society of Bali is such that religion permeates every single aspect of it and everybody in that culture is very, very carefully defined in terms of who they are, what their status is and what their role in life is. It's all defined by the church; they have very peculiar calendars and a very peculiar set of customs and rituals, which are precisely defined and, oddly enough, they are fantastically good at being very, very productive with their rice harvest. In the 70s, people came in and noticed that the rice harvest was determined by the temple calendar. It seemed to be totally nonsensical, so they said, 'Get rid of all this, we can help you make your rice harvest much, much more productive than even you're, very successfully, doing at the moment. Use these pesticides, use this calendar, do this, that and the other'. So they started and for two or three years the rice production went up enormously, but the whole predator/prey/pest balance went completely out of kilter. Very shortly, the rice harvest plummeted again and the Balinese said, 'Screw it, we're going back to the temple calendar!' and they reinstated what was there before and it all worked again absolutely perfectly. It's all very well to say that basing the rice harvest on something as irrational and meaningless as a religion is stupid - they should be able to work it out more logically than that, but they might just as well say to us, 'Your culture and society works on the basis of money and that's a fiction, so why don't you get rid of it and just co-operate with each other' - we know it's not going to work!..

..this bit of engineering practice and that bit of architectural practice; you don't really know what to make of them. Compare that to somebody who tosses a cricket ball at you. You can sit and watch it and say, 'It's going at 17 degrees'..

..instead of going through all the business of trying to work out the angles and trying to digest which genuine architectural principles you may want to take out of what may be a passing architectural fad, just ask yourself, 'how would a dragon live here?' We are used to thinking in terms of organic creatures; an organic creature may consist of an enormous complexity of all sorts of different variables that are beyond our ability to resolve but we know how organic creatures live. We've never seen a dragon but we've all got an idea of what a dragon is like, so we can say, 'Well if a dragon went through here, he'd get stuck just here and a little bit cross over there because he couldn't see that and he'd wave his tail and knock that vase over'. You figure out how the dragon's going to be happy here and lo and behold! you've suddenly got a place that makes sense for other organic creatures, such as ourselves, to live in.

http://www.biota.org/people/douglasadams/