PS our paper itself is here: https://www.primalpoly.com/s/Todd-Millerevpsych-of-ETIBioTheory2017.pdf …
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Exploration and adventure require incentives. Humans' biggest incentive for those, and for building civilization, is reproductive success, aka the sex drive. Other intelligent beings may not have the same incentive.
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Evolutionary psychology provides a good explanation for the Fermi paradox, IMO.
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Maybe colonizing space or exploring it doesn't further their reproductive goals, or has rapidly diminishing returns.
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