Who needs an argument?
The kind of things 19th century English geniuses believed will set your teeth chattering:
Galton feared that the English race was degenerating, declining in both mental and physical ability. (It remains a common fear; the French thought they were degenerating, too.) Like others of his day, Galton used the term ‘race’ loosely. He referred alternately to the English race, the white race, the human race. But overall, English eugenics was less about race than class. To Galton’s mind, the filthy working poor were breeding like rabbits while the gentry were chastely dwindling. He became convinced that unless something were done, the flower of English manhood – not excluding specimens such as his cousin and, ahem, himself – would soon vanish, swamped by a massive tide of Oliver Twists and Tiny Tims.
Thank goodness that preposterous conviction has been rigorously debunked.