Regarding Point 1, if the null hypothesis stating that humans carry no genes predisposing them to criminality or ASB is true, then there is no assortative mating bias because mating patterns would have no genetic influence on these behaviors, and any observed MZ-DZ correlational differences would be caused entirely by non-genetic factors.  In order for Barnes and colleagues to be able to claim that assortative (non-random) mating patterns “downwardly bias heritability estimates” for criminality and ASB, they had to assume in advance that there are genes predisposing people for criminality and ASB. In other words, Barnes and colleagues assumed an important role for genetics as a means of concluding in favor of the very same thing, and like supporters of Argument A , their conclusion was based on illogical circular reasoning because it merely restated their premise in slightly different terms.
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