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Seems like the original poster doesn't really know any childless-by-choice folks. There are lots of reasons why someone who likes children and/or works with them might not want any of her own. Many don't mind playing with children in short bursts, for example. I love my nieces, but can only spend about 48 hours with them...I can't imagine dealing with them 24/7. As for a child-friendly but childless-by-choice preschool teacher, taking care of children all day is a job, and she very likely found that going home to a quiet, orderly apartment where ten or fifteen little voices weren't all clamoring at her at once was a great relief.
This poster apparently harbors the attitude that parenthood is inevitable...big deal if birth control fails. It's fortunate that parenthood suited this couple enough that they wanted a second child. But what if it hadn't? There are lots of folks out there who don't want to be parents and know that they shouldn't be parents. Please respect their preferences.