By James Toomey
Kathryn Paige Harden’s The Genetic Lottery: Why DNA Matters for Social Equality is a thoughtful, thorough, and well-written book about the compatibility of behavioral genetics with progressive ideology. Weaving together her own fascinating work in genetics with Rawlsian political philosophy, Harden’s book is necessary reading for anyone interested in inheritance or politics — which, I suppose, is everyone.
The basic argument of the book is that the so-called First Law of Behavioral Genetics is correct — everything is heritable. Harden supports this claim with a wealth of research in genetics over the past few decades, with an emphasis on her own contributions (“within a group of children who are all in school, nearly all of the differences in general [executive function] are estimated to be due to the genetic differences between them”). More importantly, Harden does not think this fact has the implications for normative politics that many, particularly on the left, worry it does. The fact that some genetic profiles cause higher general intelligence — or anything else — does not mean those who have them are better or more deserving of society’s bounty and social prestige. We can, and should, adopt “anti-eugenic” policies designed to make better as much as possible the lives of the genetically “unluckiest.”
Accepting Harden’s descriptive premises, I find her political theory basically right. But the book elides a crucial distinction in left-leaning political thought that, I think, misses something about why so many on the left find the prospect of the heritability of mental characteristics so troubling, and which perhaps diminishes the book’s ability to persuade its target audience (which, frankly, is not me, having been already convinced on much of this by The Blank Slate).