You are claiming an unnuanced perspective on Gould's part. I would reread it look for his pleas for ambiguity and lack of clarity in the split between nature and nurture. Second, you've asserted liberalism on the part of Murray and Herrnstein. I would ask you to hold the definitions of classical liberalism of 1800 in mind with modern liberalism of 2021. Liberalism evolved substantially, so defining your specific terms is important.

However, the work is on your part, not mine. If you engage with it with an open mind, your perspective will undoubtedly become more nuanced, as is appropriate.