I can understand it for population control and the religious use: https://en.wikipedia.org/wiki/Antinatalism#In_religions {There is a reason the coolest religions are quoted there}

But the philosophy says it's morally 'bad' and that is were it becomes a numbers game.

I've listened to this podcast about a year ago, the first time I've come across Anti-natalism in modern times: https://samharris.org/podcasts/107-life-actually-worth-living/ And one of the few times I was 100% on Sam's side. (Funny thing: It's Sam Harris would has written and debates extensively that suffering can be measured and morality should be geared towards reducing it)

I myself am not pro nor anti, it's all really/heavily depended upon the personal context of the people involved. Though overall it's Wisdom to know that nature finds its way, through extinction of sentient life or not.