I find most people who espouse your views typically don’t because the people they are always imagining dying/killing/banning from having babies are usually in the third-world, or at least very far away. They don’t imagine the very real killing, wars, etc. that would have to take place to forcibly sterilize people.
I don’t think organic agriculture is such an important end that we should render 7/8 of the population dead or infertile so that we can transition to organic.