I've seen this quite a bit. I work where I can read reports on families with children who have genetic problems. These children suffer horribly, will probably die before they're adults and the doctors simply shake their heads - outside from where the parents can see them, of course - and wonder why these people continue to have children even though they know the risks to their offspring. Because you see, if you cast any kind of aspersion on someone's desire to have children - no matter how misguided their reasons will be - you will likely get verbally stoned by society.
That seems kind of extreme, though. I mean, if the doctors are shaking their heads to other people, then presumably those other people aren't stoning them. Maybe the doctors aren't shaking their heads where the parents can see them not out of fear of getting verbally stoned by the parents for having un-PC ideas about procreation, but out of a professional reluctance to blame the families for their patients' health problem. I'm not saying the parents made the right decision. I'm just saying that a doctor saying, essentially, "This is all your fault -- you should never have had kids in the first place" is probably not considered ideal bedside manner.
I don't know anything about these cases. But I would bet that the parents had hoped, however foolishly, to beat the genetic odds. And if they didn't, they're no doubt suffering considerably, too.
They love children! It's an inalienable right! How dare you criticize them for having children?!?! And the kids suffer and suffer and suffer and I cannot imagine why these parents can't be locked up for child abuse.
People continue to have children even when they cannot feed their children because it's a mark of their manhood or womanhood. And they'd rather sacrifice the children they have - their lives sometimes - than go against their status in their society.
I find myself thinking that whenever I see those "Save the Children" commercials. You see this tiny child living in appalling conditions and I wonder why her mother and father even thought to bring a child into their world.
It's interesting to see the kinds of pressures felt by people who don't have children. I really don't think the pressures are that great in my community (and by community, I mean friends, family, coworkers, etc., as well as geographic neighbors). I know lots and lots of people who don't have kids, including straight, married couples (for whom it would have been relatively easy and "expected"), including several close friends, my thrice-married step-mother, and my three female cousins, now in their 50s, who grew up very traditionally on a farm in Iowa and have all been married, two of them for decades. I've never heard of anybody saying anything about these people's non-breeding (not that I'd know about all family conversations, of course).
I myself never felt any pressure, and I had my first child at almost 37. On the contrary, when I told my dad I was pregnant, his first question was, "Are you going to ... have it?" Which even I have to admit seems odd to ask, given that I was married, healthy and financially secure! Maybe he just didn't want me to make the same mistake he did.