Ah, sorry, I'd assumed that, though you talked about other things in your post, you still wanted attempted answers to the question in the title.

EDIT: also note that this provides a nice test of the value of heuristics with biases. If everyone on earth had them instead of didn't, would it be more valuable than a few million Africans?

Biases may not always be a bad thing, but you can't tell whether they're good in any specific case without comparing them objectively to an unbiased position. You can't skip straight to second order rationality without employing first order rationality first. If biases are bad on average, then as a rule you're generally better off assuming that it's better not to preserve your bias.