A child who exists only to provide genetic material is not a child but a slave and the claim that they only harvest stem cells is something people who oppose it will dispute.
Emotionally battering your kids into donating organs and just straight up lying about why you inseminated yourself happens all the time.
...Again, it's from afterbirth materials. Amniotic fluid, placentals tissue, and umbilical cord blood. There's no mental trauma in getting them to agree to it because
the only thing they need to do is be born. All the materials are in the inherent aftermath of that, no need to take it out on the child.
For a savior sibling to have good odds of
working, you
have to specifically test for a genetic match beyond simply not having the genetic defect or else you end up with no better odds than just doing it the natural way, and this testing is
not something easily doable off the grid. And for larger organs you have the size dependencies so you need to have the older sibling survive long enough for the younger to grow to a close enough size.
So I'm calling bullshit on it happening at any meaningful scale because there's way too damn much that has to go wrong for it to get to that point. Sure, some people manage to go to horrifying lengths to get what they want, but then we've been over this with abortion and homosexuality already. If it's
possible to do and people have a drive for it, they'll put up with some truly absurd things to do it, so removing those barriers to focus on the worst cases tends to make things better as they don't do as much horrible shit on the way to the taboo thing and you have a lot more resources to deal with the worst cases.
Alright Bacle, let me just say this religion is what is best used to justify morals because otherwise you are just listening to imperfect humans and their oppinions.
You can't get away from that without physically-present Angels or other such divine emissaries on hand because the Clergy telling you what the book says are imperfect humans relaying their opinion. There's
fuck all way to get over this logical hurdle with demonstrable fact because all the answers to the quandary rely on metaphysics and axiomatic assertions.
Religion's a nice way to be able to call bullshit on your leaders and keep the population on the same page, but that's all it is from an empirical perspective, because anything further cannot be proven true, and usually cannot be proven false.