You focused so much on the strawman (infertility) that you forgot to answer the very real question right behind it (stigmatization of people who voluntarily choose to be child-free).
The question which was not related to the one brought up here and only was used to initiate some blame-gaming? No, since it bears no relevance to the actual question I see no need to answer it. I'll stick to the subject at hand which was what are the benefits to having children.