Since the Supreme Court overturned Roe v. Wade, there's been an ongoing increase in adults ages 18 to 30 who undergo tubal ligation or vasectomy, new research shows.
Well, except for the quiver-full crowd and all the women indoctrinated into the barefoot and pregnant school of thought.
In other words, the poor, stupid, and indoctrinated will continue to spew out kids while the educated and reasoned will make the choice not to, therefore the stupid will inherit the earth.
I don't see how that depends on it being nature or nurture. Nature: they will be like their parents because of genetics. Nurture: they will be like their parents because that's who's raising them.