What justifies a positive ethics (as opposed to a negative one)? So I have some questions for you
; What are you views on the consent problem with regards to being born and vice versa the exact same problem with regards to dying?
I did not consent to have life, neither did I consent for life to one day end.
Then as with all ethical principles; we have to justify to ourselves whether or not a demanding principle will ever be universally applicable. If Antinatalism is ethical, why not genocide or mass sterilisation? Come to think of it, in order to really eliminate pain and suffering, (important distinctions which I'll get to in a moment) doesn't the problem demand a universe ending solution? Is that not a little too demanding of a principle for our small little species to have?
Finally on the difference between pain and suffering. We have very little control over whether we feel pain. Pain is a cold hard objective truth about the human experience. Suffering however, that is letting the abstract self via esteem or ego be harmed is entirely within ones own control. You can just not put your sense of self value on such shaky pedestals that bodily pain has any bearing on them. You dont have control of your body, it's out of your control. Bacteria doesn't ask our permission to make us sick its just trying to live itself. You can make choices which contribute towards positive outcomes but the outcomes themselves are mostly out of your control. You can be healthy as a horse and still fall and break your leg.
If we want to go into the deep why of why we believe or do anything then maybe I'll claim to be a complete fatal asteroidist and claim that absolutely everything is pointless because tomorrow might be Asteroid impact day. Or as the Gauls would say, "The sky will fall on our heads tomorrow, but tomorrow never comes."
The key thing to remember is that humans are getting better at reducing pain inducing environments.
Can I ask you something which I feel is very important? How teachable is Antinatalism to a child? How would a child feel if they were told that having children is the worst thing a person could do? Pretty sure the reaction would not be a good one.
You seem to know a lot about your ethical principles, but what about your metaethical ones?