The thing I never understood about the US is why asking for someone's "race" (or whatever the current PC term for it is) on a form, government or otherwise, is

The thing I never understood about the US is why asking for someone's "race" (or whatever the current PC term for it is) on a form, government or otherwise, is not flat out illegal on account of being a) entirely meaningless b) downright insulting c) guaranteed to produce the kind of outcome we're discussing here.