Which is why most leftists favored the "blank slate" or tabula rasa theory when I was growing up fifty years ago. If you agreed with that "theory," then the only differences between different ethnic groups in wealth or achievement could be attributed to discrimination and oppression by one group over another. That theory has since been thoroughly disproved, but it hasn't stopped many leftists in believing in and promoting that theory. Of course, most arch-feminists still believe in that theory. Many, including Gloria Steinem, still argue that males and females are exactly the same apart from sexual differences.
If different rates of achievement could be attributed to individual, hard-wired genetic characteristics and not one group oppressing another, the edifice of lies that constitutes leftism would be thoroughly discredited.
You are right on the mark. This is why it is so very important that people who want to preserve their heritage stand up for scholars like Jason Richwine. The Left has been getting away with destroying the conceptual foundation for our heritage by screaming insult at anyone who addresses the realities of human achievement. Along the way, they sabotage the future of some of the very groups they pretend to be protecting and advancing.
We all have different aptitudes, different incentives--different personalities. The more we know about any segment of the population, the better we can acutally help them solve their problems. The mythical ostrich that handled his social problems by putting his head under the sand, epitomized failure.
On your points in Reply #33, see The Greatest Mischief Ever Wrought.
William Flax