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MugaSofer comments on LW Women- Minimizing the Inferential Distance - Less Wrong
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When epistemic rationality is counter to instrumental rationality
Epistemic rationality is about knowing the truth. Instrumental rationality is about meeting your goals.
The general case is that the more truth you know, the better you are at meeting your goals (and so instrumental and epistemic rationality are heavily tied to each other), however there exist rare occurrences where this is not the case.
More importantly, there are many times when SPEAKING the truth is counter to your goals.
For an absurd example: Say you are in a room full of angry convicts with knives. It probably is counter to your goal of staying alive and healthy to start proclaiming TRUE but insulting statements.
More realistically, raising children is one example where, if your goal is to raise happy, sane, well-adjusted adults, there are many statements that should NOT be spoken, no matter how true they are.
Examples:
Even if it the cooking and cleaning statement were epistemically true, it is not instrumentally rational to tell this to your child if your goal is to have her grow into an independent adult who can support herself, and does not feel bound by the "traditional" gender roles (which are falling out of favor anyway).
Likewise, if you value having a higher percentage of women on this site, it is not instrumentally rational to make statements such as "You only got upvoted because you're a girl", or "<X> girls aren't as attractive as <Y> girls," EVEN IF you believe that said statements are true.
I highly value truth. But a prime reason I value it is because it allows me to meet my goals. When speaking the truth is harmful to my goals, it is wise to hold my tongue.
As a vegetarian, I am obligated to point out that you shouldn't have to hide torture from your kids because there shouldn't be torture. How would you like it if it turned out that your car was secretly powered by a forsaken child, but the government covered it up because it might make you depressed? You wouldn't thank them for protecting your mental health, you would condemn them for allowing a horrible injustice to continue by suppressing the populace's natural horror.
</rant>
Ahem.
You're absolutely right, concealing lovecraftian mindbreaking knowledge is a good thing, because duh. Thank you for pointing this out, it's easy to forget "what we should say" is not the same as "what we should believe".