‘The desire to die was my one and only concern; to it I have sacrificed everything, even death.’ –Cioran
The most extreme proponent of anti-natalism is probably David Benatar, author of Better Never to Have Been, which maintains that:
(1) Coming into existence is always a serious harm. (2) It is always wrong to have children. (3) It is wrong not to abort fetuses at the earlier stages of gestation. (4) It would be better if, as a result of there being no new people, humanity became extinct.