These are big claims and you’d surely expect Wade to provide some pretty impressive, if recondite, evidence for them from the new science of genomics. And here’s where things get odd. Hard evidence for Wade’s thesis is nearly nonexistent. Odder still, Wade concedes as much at the start of A Troublesome Inheritance:
Readers should be fully aware that in chapters 6 through 10 they are leaving the world of hard science and entering into a much more speculative arena at the interface of history, economics and human evolution.
It perhaps would have been best if this sentence had been reprinted at the top of each page in chapters 6 through 10.
One of the most frustrating features of A Troublesome Inheritance is that Wade wants to have it both ways. At one moment, he will concede that he writes in a “speculative arena” and, at the next, he will issue pseudofactual pronouncements (“social behavior, of Chinese and others, is genetically shaped”). This strategy lets Wade move in a kind of intellectual no-man’s-land where he gets to look like he’s doing science (so many facts about genomes!) while covering himself with caveats that, well, it’s all speculative.