The social effects at scale are what bothers me. Just wait a century until employers put "no genetic defects" in their job applications. Or parents who decide to have old fashioned non-designer babies have trouble getting their kids insured. Or homophobia will become normalized again because "they should have fixed it in the womb". Is this a sufficient reason to not prevent genetic defects? Who can say.
The article is literally about removing the extra chromosome and not aborting the fetuses...
But yes, I do actually think there is a moral imperative to abort fetuses with diseases that will extremely negatively impact the life of the person and of the people who will have to care for them.
That doesn't mean we shouldn't care for them if they happen to be born, not at all, but I don't really understand how it can be controversial otherwise.
If Nazis hadn't practiced eugenics it wouldn't have been shuned as it is today.
There's nothing wrong with eugenics in itself, just with how it's applied.