... If, on the other hand, what is offered is that parents could (for example) freely choose to conceive a child without cystic fibrosis, then how is that a "specter"? That's a genie.
My first thoughts were along those lines -- eliminate sickle cell by altering the gene -- but then the issue becomes who has access to this and who doesn't.
Gattaca - Wikipedia
If it is part of a universal health program where the emphasis is on eliminating the most horrid genetic diseases from
ALL peoples then it can be a tool for greater good.
If it is part of a for-profit health system where only the very wealthy can afford it then it will be a tool for evil.
Enjoy