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The whole argument about "use" is inane anyways. Why would analyzing genetic variation and its selection need to be justified by reference to "use"? When we are analyzing finch variations in the Galapagos, a la Charles Darwin, did anybody take Darwin aside and say "holy fuck Charles, didn't you know that there's no 'use' to analyzing why different populations of finches have evolved different adaptations? What is the 'use' of knowing that one obscure finch has a different bill structure than another? Ergo, your science is wrong." This invocation of a 'useful' criterion is sham-science, a backdoor to moral condemnation, which is what is being attempted in reality.
It's certainly possible you might get some pragmatic 'use' out of such analysis, but it is ass-backwards to think that the validity of such analysis is derived from whether it is 'useful.' The primary scientific question is whether selection has been at work on genetic variation between the populations, what the extent of that selection is, why it has happened, and what its effects are, not whether it is 'useful,' which is a secondary artifact at best.
It's certainly possible you might get some pragmatic 'use' out of such analysis, but it is ass-backwards to think that the validity of such analysis is derived from whether it is 'useful.' The primary scientific question is whether selection has been at work on genetic variation between the populations, what the extent of that selection is, why it has happened, and what its effects are, not whether it is 'useful,' which is a secondary artifact at best.