The "slippery slope" can lead to some strange places. My sainted mother might have prevented decades of springtime misery, not to mention a drain on Kleenex budgets, if her son's semiannual allergies had been detected.

But more seriously, at what point can it be decided that male children are more valuable to a given society than female children, so the latter are terminated? Or any number of physical traits, from diabetes to malformed body parts to physical size? Often well-intentioned, of course, but practically creating a "petri dish" assembly of human beings.

Wasn't the losing side in a world war, an ideology that's found itself some recent attention, into this sort of thing?