I don't know if the idea started in Germany. Create a MASTER RACE of blue eyed blonds who were very strong.
Designer children. You give your specs to the genetic engineers and they will "modify" the dna of the fetus so that the end product meets with your approval.
Also and more importantly you eliminate any DNA that could cause harm disease suffering death.
In other words you now can play GOD.
Dial a child. Like winning the lottery only there is no guesswork or random chance. It's certain you will get what you want. For a price of course.
What is the harm in removing/eliminating the possibility of disease early on? Free humans from pain and suffering? How could that possibly be a bad thing? I don't think it is if that's where you stop.
But well where do you stop? If you have the ability to create human beings TO ORDER how do you not start doing that for the wealthy?
Can it be a noble enterprise if you control the extent of it or is all of it dangerous? I dunno. Do you?