A huge amount of American public school policy is grounded in noticing that there are massive and systemic discrepancies in academic achievement between students of different racial backgrounds, and trying to figure out what to do about that. If you paid any attention to the Algebra I controversy in San Francisco public schools recently, that was largely driven by bureaucrats and activists within the public education system who were concerned by racial discrepancies in the ability to do Algebra I work. "some races are smarter than others" is too reductive a claim, but claims pretty closely related to that are relevant to a lot of things in American life. I don't think anything Watson said about racial differences existing was obviously incorrect, regardless of whether you use the word "eugenics" to describe it or not.