The ancient Spartans did this with, at least, the motive of eugenics in mind. Why do moderns do it? Ostensibly, pure selfishness. Surreptitiously and structurally, it is pagan worship of latter-day Moloch. It is infanticide, crass and destestable.
Bless those who want to offer funeral blessings, at least, to this smallest, voiceless victim.