I can see the rationale of this....
I should first clarify that I DO NOT have children...Nor do I want them in the forseeable future; but that does not change that fact that I still have a 'heart', and I would want my child (if I had one) to live.
Having said that, however...I know that IF I ever gave birth to an extremely premature baby, and the odds were not in favor for the child...or if the baby were inclined to develope extreme disabilities, I would NOT want to see that child struggle. Granted, it would not be a decision I would relish making (in fact, it would be heartbreakingly hard), and I would want to know all the facts before making it...but I think I would decide to let 'nature' take it's course (ie; take the child off of any life-sustaining measures/equiptment). If the child lives....that's what was intended. If the child dies...of course I would be heartbroken, but I would realize there's only SO MUCH suffering a human can take.
I'm sure there are many people alive today with severe disabilities that are grateful to be here; it's human nature to WANT to live...Yet I think I would love my child enough to be able to let it "go" if conditions were that bad.
It's also human nature to want to keep our offspring alive....I know this...but some people have to analyze; are they simply being selfish? After all, how much pain does a severely dibilitated infant go thru?....and the infant doesn't understand it!
Modern medicine has drugs which will suppress a premature delivery...but sometimes these drugs only go so far..and the baby IS born far too premature.....Fact is, not ALL babies that "shouldn't" be born will miscarry (esp. with Western medicine)...the ones that are born with only half developed lungs, limbs, or brain....is it really worth the suffering of the baby/parents/society to make them suffer and go on, when most probably the shouldn't.....????
Yes....a hard decision to make, indeed.