The book-reading equivalent of watching paint dry is trying to imagine an eugenic thriller based upon a debate among eugenists over when to sterilize a 'defective' child before they can reproduce more 'defectives'.
Sterilize them at birth or age one or age thirteen or even wait till age sixteen ?
Yawn !
Because Eugenics is supposedly about extremely 'fixed' 'unmoving' 'known' hereditary qualities, by definition it is hard to build up a good Moral Panic around it.