"In this perspective, reproduction makes us the only ones responsible for creating suffering in the world. Without us, there would be no pain. But there is, and it's our fault. Objectively, pain is not a bad thing, but it is subjectively. We, as living beings, have pain as the supreme reference point for everything that is undesirable. Our objective, biological nature imposes this condition on us. Just as pleasure is good, pain is bad - whether physical, emotional or psychological. Let the relativists stand up, with their crazy theories about the “arbitrariness” of the issue: we would like to see them believe this while we insert spikes under their nails. The presence of pain as something positively undesirable is an essential requirement for life to be sustainable, it is a condition imposed objectively on the survival machines that we are. Pain makes us efficient organisms, and without it we would not function properly, we would just die painlessly for ignoring the dangers that surround us. This means that when we make all the pain that exists on earth appear out of nothingness, when we put matter in the only condition in which it can suffer, that is, when we transform it into a living being, we become positively evil, responsible for the dissemination of suffering. Thus, intentional reproduction makes us perverse and immoral beings, and this in a purely objective sense, because it is a universally valid judgment, whatever the circumstances in which we find ourselves. As long as there is pain in existence, as long as life involves suffering, the act of reproducing means collaborating with its growth, perpetuating this misfortune, actively endeavoring to make the world a more painful and pitiful place."
January 1, 1970
https://en.wikiquote.org/wiki/Antinatalism