Ah, I think you may have gotten the wrong idea when I said truth was incidental, that a thing is incidental does not stop it from being useful and a good idea, it is just not a goal in and of itself. Fortunately, no-one here is actually suggesting active self-deception as a viable strategy. I would suggest reading Terminal values and Instrumental Values. Truth seeking is an instrumental value, in that it is useful to reach the terminal values of whatever your actual goals are. So far as I can tell, we actually agree on the subject for all relevant purposes.
You may also want to read the tragedy of group selectionism.
Thanks for the group selection link. Unfortunately I'd have to say, to the best of my non-expert judgement, that the current trends in the field disagrees somewhat with Eliezer in this regard. The 60s group selection was definitely overstated and problematic, but quite a few biologists feel that this resulted in the idea being ruled out entirely in a kind of overreaction to the original mistakes. Even Dawkins, who's traditionally dismissed group selection, acknowledged it may play more of a role than he previously thought. So its been refined and is making...
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