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Tom_Talbot comments on Instrumental Rationality is a Chimera - Less Wrong
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A belief that galaxies exist is a rational belief, but has no instrumental value. It is simply true.
It's instrumental to the goal of understanding the universe. Moreover, if I didn't believe that galaxies exist I doubt I would be getting paid to study them.
No, a belief that galaxies exist is rational given certain evidence.
Your claim about its instrumental value is simply wrong. Any knowledge is useful if it has consequences for something we wish to do, and the only way to know whether a given piece of knowledge has such consequences is to know it well.