It is a horror because 80 years earlier, a little further east, boys, even with no known Jewish ancestry, were murdered because members of their countries' establishment measured their noses and chose them for death on that basis.
That mindset, categorising humans, and human worth, on the basis of certain physical characteristics, is dangerous. She wasn't writing novels. She wasn't writing as an insider. She was writing about children in specific identifiable schools as though she was a naturalist describing exotic species. A very colonialist mindset - like those Belgian zoos that exhibited humans.
Anyhow, Clanchy's style, nice lady being benevolent to the deserving poor, reminds me of Camila Batmandelidjh in the way she was briefly lionised by the London-centric media. Different personal presentation, different approach, provoking a similar sense of distaste.