> we literally have two groups of people called “black people” and “white people”.

Huh ? There are no "white people" or "black people". Just take a look at the people around you: everyone has its own colour given by genetics, sun exposure, origin, diet (a sick liver darkens a bit your skin for example). I've seen people with a skin like milk chocolate.

They just did a quick testing to get the aproval and called it a day. Testing is hard and expensive.