If one subtracted the metaphysics of will from Schopenhauer’s general philosophy some non-metaphysical antinatalism would have to ensue. Therefore, one might suspect that after the demise of German idealism a corresponding thinker, an outspoken antinatalist, would have taken up the vacant systematic place well before the still hesitant antinatalist pronouncements by Norwegian thinker Zapffe or in the setting of Negative Utilitarianism (first and foremost by Hermann Vetter).
As a matter of fact there is such a philosopher. He wrote under the pseudonym of KURNIG defending an outspoken and – with respect to Schopenhauer or Eduard von Hartmann – non-metaphysikal antinatalism.
Here are two quotations from his work ‘Neo-Nihilimus’ as a sample:
“I consider human life as something which is overall unpleasant, as a misfortune. Unborn people would not ask for it. In the face of abysmal misery I was unable to simply watch taking on the passive role of an observer.”
“I beget you (we hear a parent saying) in order to see with pleasure what is inside you and what is not. By the same token, however, I am forcing upon you a lot of suffering and, finally, the ghastly catastrophe of dying.” [Kurnig, Der Neo-Nihilismus. Anti-Militarismus. Sexualleben (Ende der Menschheit), Verlag Max Sängewald, Leipzig 1903]
Those who read German may want to have a look at my contribution on Kurnig’s early antinatalism [website is currently being reworked]: Exodus aus dem Sein. Kurnigs Neo-Nihilismus als buddhistisch säkularisierter Geist des frühen Christentums