He’s not mixing any of those things
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Look at how quickly certain purebred dog breeds have gone from working dogs to literally being unable to function properly without medical attention due to our selective breeding. That's a pretty damning condemnation of our ability to maximise fitness by selecting for traits.
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People always jump to distantly related animals with weak kin selection, no pack dynamics, and no generational knowledge transfer. It’s weird. Look at animals that have those and Sexy Son clearly doesn’t matter as much.
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