You won't find a single statistic whose difference can be clearly attributed to cultural rather than some genetic factor either.
This is an isolated demand for proof. At the level of proof you're demanding, basically nothing can be said about anything in terms of social science one way or the other. There are basically never 'single statistics' that are isolated from all alternative explanation.
Instead, one should apply the same standards and skepticism to all hypotheses. In this case, both for and against genetic/cultural explanations.
(Even so, "you won't find a single statistic whose difference can be clearly attributed to genetics rather than some cultural factor" is untrue; differences in athletic performance satisfy this demand.)
This is an isolated demand for proof. At the level of proof you're demanding, basically nothing can be said about anything in terms of social science one way or the other. There are basically never 'single statistics' that are isolated from all alternative explanation.
Instead, one should apply the same standards and skepticism to all hypotheses. In this case, both for and against genetic/cultural explanations.
(Even so, "you won't find a single statistic whose difference can be clearly attributed to genetics rather than some cultural factor" is untrue; differences in athletic performance satisfy this demand.)