You should have kids. Not because it’s fun, or rewarding, or in your evolutionary self-interest. You should have kids because it’s your moral duty to do so.Vox.com rejected it by saying:
My argument is simple. Most people live lives that are, on net, happy. For them to never exist, then, would be to deny them that happiness. And because I think we have a moral duty to maximize the amount of happiness in the world, that means that we all have an obligation to make the world as populated as can be.
I ran the piece by some other editors and they weren't comfortable running it; I think the concern is that people will misinterpret it as implying opposition to abortion rights and birth control, which, while I know it's not your intent, is a real concern.You can read the Tannsjo article on Gawker. While I found the essay unconvincing, the author has written a book on the subject that is taken seriously by other philosophers, and he is pro-abortion.
Apparently Vox will not permit an opinion if it can be misconstrued as being anti-abortion.