The use of skin color, as opposed to other criteria, is historical accident and entirely arbitrary.

Citation needed. I don't think just a bland assertion will suffice :-)

We're comparing two groups of people in a country where every ethnic group that comes over gets dumped into a blender set on "chunky".

Maybe you are. I'm not. The world is bigger and more interesting than the United States. In particular, Americans are notorious for looking at the multicoloured world of races in a just-black-and-white way. I'm not arguing that the racial classification the US government uses makes any kind of sense :-/

You're also overestimating the blender rpm.