There are two possibilities: nature and nurture.
You continue to make a charge that it’s some sort of personal opinion of mine–and nothing more–to ascribe that pattern to nature. I have given cite after cite showing an inability to eliminate the disparity despite very specific efforts to normalize for nurture–indeed, in the field of US education, despite very specific efforts to give an additional helping hand well beyond what is extended to non-underrepresented minorities. These efforts may be deemed unsatisfactory to you. Perhaps, for instance, you are convinced there is some secret and unaccounted-for nurturing block that prevents blacks given identical educational opportunity from coming even close to Eurasians on the MCATS, or that prevents them from coming even close on post-medical school licensing exams (again, despite equal opportunity). Perhaps you suspect similar nurturing blocks in black families of high income, or black families with educated parents. Perhaps you suspect some undiscovered bad nurturing is blocking black success in STEM PhDs but not black success in basketball.
But to pretend that I’ve simply formed a unilateral and premature opinion not based on “science” when all the available data out there supports ONLY my view that the differences are immutable is at best disingenuous and at worst deliberate hyperbole.
If we were dealing with animal husbandry and not humans, with attendant social consequences and altruistic overlays, this debate would be long over.