That doesn't mean that the view is factually inaccurate though does it? I think the best way to avoid oppression is to define and prohibit the practice of it, rather than measure the outcomes. This is what civil rights seems to be all about.
> differences are inherent and unchangeable
I never said that, I said that different childhood circumstances, cultural practices, and domestic environments clearly produce vastly different outcomes. I also think that using authority to standardize how children are raised would be tyrannical.
Most fundamentally, if you want to raise your children without, for instance, an emphasis on educational attainment, you should have the right to do so. Also, no one should be surprised that children raised in such circumstances don't go on to have equality of economic outcome. And no one should get bent out of shape about these facts in combination, as they are not a product of "marginalization".