I think you might be missing the point.

The apparent concern that these comments show for the well being of children is misdirection and rationalization, hiding the true intent behind anti-natalist perspectives, which are fundamentally eugenic in nature.

At their foundation, these comments presume that there are people who deserve to have children, and that there are people that do not—in other words, that there are children that deserve to be born, and that there are children that do not deserve to be born.

Poverty is just a proxy for other qualities that would be much too controversial to articulate explicitly.

Not really, just that there is a lot of suffering (not to mention many willing adoptees) out there, and that there is no need to create more suffering by having children one cannot adequately care for, it is not some sort of hidden conspiracy theory to advance eugenics. If that is what you believe, then it is likely that nothing anyone says here will sway you out of that viewpoint. If anything, the anti-natalists will extinguish themselves anyway, so the problem solves itself.

I think you might be misreading some of these comments. I also wonder if you are aware of the history of eugenicist ideas in the west, and how enmeshed those concepts are in many every-day attitudes about who should be having children—often without people understanding the history (and original intention) of policies they espouse. I am not advancing any kind of conspiracy theory here.

And I think you misrepresent the potential harm. Anti-natalists don't just want to forgo having children. Many anti-natalists also want to discourage or prevent other people from having children. In fact, I'm sure many people making anti-natalist comments here do intend to have children themselves—they just want to discourage or prevent other people they find undesirable from having kids.

I have not seen or met any anti-natalists that explicitly want to stop others from having children, and if there are any, that's such a fringe minority as to be inconsequential (just like in other thought groups, like vegans). The vast majority of anti-natalists are like the ones in some of these comments, asking whether it is moral to have children. They are not pushing that onto others.

I have at places like PP.

I was surprised to find such confidently ignorant and repulsive takes. It's one thing to have your own goals for your kids, it's quite another to set some ludicrous standard for others.