In practice, a culture that thinks Terri Schiavo's life in Florida or the cleft-lipped baby's in Herefordshire has no value winds up ascribing no value to life in general. Hence, the shrivelled fertility rates in Europe and in blue-state America: John Kerry won the 16 states with the lowest birth rates; George W Bush took 25 of the 26 states with the highest.
Known as the Roe Effect!