At least two reasons: 1. It's been the default answer for millenium, and there has only been pushback on this for the last 50-ish years. 2. Because individual

At least two reasons: 1. It's been the default answer for millenium, and there has only been pushback on this for the last 50-ish years. 2. Because individual variation is often larger than the group variance? 3. (Related to 2.) Because it's often not a useful answer. E.g. Suppose it were proven that women were worse at math than men. Would that change how we taught boys and girls? It almost certainly would, and it almost certainly would be detrimental for the little girls. [note: There is a lot more that could be said here, that I won't say because it would take too long] These aren't reasons to not do the research, but they are reasons that we should be deeply suspicious of research that satisfies our cultural biases.