It's somewhat taboo to mention that though. Reminds me of a Charles Murray's The Bell Curve, which merely pointed out that various races have differing average intelligence. Despite clarifying that the standard deviation was much wider than any of the differences (so you cannot judge an individual based on the results), the author was shamed, blacklisted, and threatened for his work.

Some people just like to live in a fairy tale where how everyone should be treated is the same as how everyone actually is.