You know, you're right. I was responding to peripheral aspects of your proposal rather than central ones, which is a waste of everyone's time. My apologies.
So, OK... rolling back: if I'm understanding you, you're hypothesizing that our biases are not design flaws, but rather adaptations to obtain the group-level benefit of having individuals be more irrational and therefore predictable.
(Is that right? I'm trying to infer a positive claim out of a series of questions, which is always tricky; if I've misunderstood your hypothetical it might be helpful to restate it more explicitly.)
Perhaps irrationality does provide a group-level benefit, as you suggest. For example, maybe it's easier to get valuable group behaviors by manipulating irrational people than by cooperating with rational ones. That doesn't strike me as too plausible, but it's possible.
Even granting that, though, I have trouble with the idea that the benefit to individual breeders exceeds the costs to the individual of being more easily manipulated by others.
[Update: and now there's a fifth discussion thread, which you should probably use in preference to this one. Later update: and a sixth -- in the discussion section, which is where these threads are living for now on. Also: tag for HP threads in the main section, and tag for HP threads in the discussion section.]
The third discussion thread is above 500 comments now, just like the others, so it's time for a new one. Predecessors: one, two, three. For anyone who's been on Mars and doesn't know what this is about: it's Eliezer's remarkable Harry Potter fanfic.
Spoiler warning and helpful suggestion (copied from those in the earlier threads):
Spoiler Warning: this thread contains unrot13'd spoilers for Harry Potter and the Methods of Rationality up to the current chapter and for the original Harry Potter series. Please continue to use rot13 for spoilers to other works of fiction, or if you have insider knowledge of future chapters of Harry Potter and the Methods of Rationality.
A suggestion: mention at the top of your comment which chapter you're commenting on, or what chapter you're up to, so that people can understand the context of your comment even after more chapters have been posted. This can also help people avoid reading spoilers for a new chapter before they realize that there is a new chapter.