Birth is as inevitable as existence, there is no opt out in the grander metaphysical scheme of things.
Also just a thought - is that really your reason for not having them? If a person truly believes the bad outweighs the good I'm less inclined to believe them when they're still among the living, because the choice to stay alive shows they see some inherent value in the state of being alive.
Personally I'm clear on why I don't want kids: because I'm a hedonist.
> the choice to stay alive shows they see some inherent value in the state of being alive.
Eh, you don't choose to live any more than you choose to breathe. Even if you don't want to live anymore you can't simply "choose" to no longer be alive. There's no suicide-fairy that neatly and quietly removes you from existence on command, and that would keep taking care of anyone who's depending on you.
Hedonism itself isn't very clear, if basic gratification is vacuous. You end up seeking gratification through aims, because having a goal is satisfying, and then you're reintroducing values other than pure pleasure, by the back door (ooer).