[C]onsider the results of the study of multiple twins while thinking about your own family. Consider a scenario in which the nonidentical twins are much less similar than identical twins, which means that sharing fewer genes makes a big difference (skipping here the technicalities of getting the number—heritability—that quantifies that result…). If this were the case, for whatever trait we are thinking about, e.g., IQ test score, we might say: “There is nothing I could do as a parent to change the outcome for my offspring. I am not to blame for the outcome other than having passed on my genes.” If that conclusion seems justified, we might then reason that the same is true for every other family, and thus society as a whole should not try to change what it is doing because it will not make a difference.
Complications
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Whys To Look For Genes: Pros and Complications 