[safek]

Since it's certainly possible that blacks have genetically higher IQs than whites but are environmentally made to underperform, isn't that all the more egregious? Wouldn't that be an important, uplifting thing to know? Why not find out?

When people are anxious about genetic explanations, it's usually because they're afraid of one group underperforming. "Look, we know blacks score lower on IQ tests, but we've got to be careful here—they have bad environments." But actually we have the tools necessary to model outcomes like this. If it's true that blacks are underscoring despite a genetic advantage, eventually this truth will emerge.

So when people are worried a priori that an investigation into genetic explanations will disfavor blacks, either they fundamentally don't believe these things can be rigorously studied, or they're worried that even under fair standards blacks will underperform. The former implies unknowability of truth, the latter genuine racism.