"Among the people who are created, there are always some who will have to suffer unspeakably. This fact, having been considered not only by Schopenhauer and other so-called pessimists, should influence anyone prepared to have a closer look only – and especially – at the 20th century to philosophize. Thus far, nobody has succeeded in demonstrating that the inconceivable, though immeasurable suffering inflicted upon human beings, in Auschwitz and elsewhere throughout time and space, can be compensated by the former or future happiness of the sufferers or of others."
January 1, 1970
https://en.wikiquote.org/wiki/Antinatalism