There are enough unhappy kids in the world to produce / release more to a point of saturation. For this reason, I've only ever considered the idea of adoption. Just like staying together when unmarried, with the other one free as a bird to leave at any instant, I feel that love is proven to be purer when it's not tied to chains, in the case of parenting about blood bonds where the feeling of selfish ego boost and belonging are distorded.
Sometimes I wonder if I have missed to become a dad since I imagine I would have made a dedicated attentive one.