Hammond nods.
"I have a certain fondness for teaching, myself," he admits. "My own calves have long since surpassed the need for it ..."
He shakes his head and centers himself.
"Life on this planet evolved. I know that because it was in the briefing, but I think it should also be common knowledge? That process of evolution did whatever random things it could that resulted in there being more babies who survived to reproduce. It didn't design anything intentionally, because it has no intention."
"Luckily for your early ancestors, it turns out that being intelligent is very helpful to surviving to have babies. So by random chance, evolution happened to stumble into a brain design that kind of worked, and kept tweaking it from there until we get to you. But it was never optimizing for being truth-seeking or correct — it just happens that being curious and correct happens to be useful in a wide variety of circumstances."
"But there are a lot more ways to do something badly then there are to do something perfectly, so it should not be surprising that evolution, in its blind fumbling, did not happen to randomly pick the perfect brain design that does everything correctly. It just happened to find an adequate brain design, with a lot of behaviors that are helpful in some cases but detrimental in others. Psychology is the study of how people's minds actually work, as opposed to the various fields of philosophy and economics which study how people's minds ought to work if they were perfect."
"So, with that background, the short answer to your question is: motivated reasoning. While coming to know true things is generally useful — and can actually shown to be optimal overall — there are specific circumstances where it's actually detrimental, either in the short term, or just to people who need to make decisions with a limited amount of time to think. In those circumstances, evolution had to find a design that would produce more viable children anyway, and so it created a brain design that does not operate purely in the realm of logic, instead incorporating various other components such as emotion, snap judgements, and habituation."
"And, to be clear, none of this is a bad thing! When I say that a perfect reasoner wouldn't let emotions cloud their judgement, that's a fact about the theory of economics, not a value judgement on the utility of emotions. The fact is that we don't get to pick our brain designs, and that just because being different 'should' be better by some metric doesn't mean we have to change. Having emotions is not only empirically good at producing large numbers of children who survive, it's also useful for understanding others, and often pleasant as an end-in-itself. So please don't think that the design of minds like ours is a problem — it's just a fact of life, the understanding of which will help you better model what other people are thinking."
"So, to return to the topic ... how good are you at lying?"