Michael Anissimov's Page

In a society composed of humans with entirely unbiased beliefs, someone with a mutation that led to this class of honest mistake in self-estimation would have an evolutionary advantage. An evolutionary selection pressure favors adaptations which not only impel us to seek power and status, but which impel us to (honestly!) believe that we are seeking power and status for altruistic reasons.
Because human evolution includes an eternal arms race between liars and lie-detectors, many social contexts create a selection pressure in favor of making honest mistakes that happen to promote personal fitness.|Section 2.3|