Even though the average black person would be slightly less intelligent than the average white person (just for the sake of argument), what difference would that make? There are absolutely no reason for anyone to grant neither black nor white people less rights than the other group based on such an average intelligence.

People are to be seen as individuals, not as parts of a race or any other such collective.

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President Josiah Bartlet: Sweden has a 100% literacy rate. 100%! How do they do that?
Leo McGarry: Maybe they don't and they can't add.