Biological determinism keeps resurfacing to justify existing hierarchies

Gould's overarching thesis is that a specific recurring idea — that social and economic inequalities between groups reflect innate, biologically fixed differences in intelligence — has appeared repeatedly across very different eras and scientific frameworks, always conveniently ranking the groups already on top of the existing social order as innately superior. He treats this recurrence as itself suspicious: legitimate findings about complex human traits shouldn't reliably align with whichever hierarchy happens to already be socially dominant.

Rather than arguing all measurement of human traits is inherently worthless, Gould's more precise claim is that this particular research program, aimed at ranking human worth by a single number, has a poor track record precisely because it starts from a conclusion and works backward toward supporting data, rather than starting from open-ended inquiry.

He uses this pattern to argue that scientific claims convenient to those already in power deserve extra scrutiny, precisely because motivated reasoning is easier to smuggle into ambiguous data when the answer is already wanted.

Takeaway: when a scientific finding conveniently justifies an existing social hierarchy, that convenience itself is a reason for heightened scrutiny, not comfort.