Uh, yeah, and that makes them fucking monsters. People with Down syndrome can still lead productive, happy lives and an increasing number of them do just that as treatments improve (with modern medicine someone with Down's can reasonably expect to live to 60, for instance) - it's not an immediately and incurably fatal birth defect like anencephaly. It's not for nothing that the casualness with which countries like Iceland have exterminated their populace with Down's in the womb has become a talking point in pro-life circles.
For all that eugenics is associated with racial supremacy, not even poor whites (who weren't Italian, Irish, or any other sort of 'white ethnic' - they were WASPs who just happened to be born into poverty in the wrong state) were spared. The Carrie Buck mentioned in that article wasn't any sort of 'white ethnic' and was the plaintiff for a case considered to be one of the worst SCOTUS ever handled, right up there with Dred Scott and Korematsu.
Eugenics is a road straight to hell. Inevitably it leads to the conclusion that human life has no innate worth (certain lives being inherently worth more than others is usually just the stepping stone before this conclusion) and those who are unworthy for one reason or another deserve no respect, therefore they can be screwed over or outright snuffed out for the 'greater good' of society's worthies; and these categories are clearly and consistently very flexible & easily expanded ones as has been demonstrated by eugenicists across states, countries and history.
Yeah, I can understand why pro-lifers would vehemently object to what Iceland and other European countries are doing with eradicating Down's Syndrome.
I know about Buck v. Bell. That case was horrible. That said, though, you don't see eugenic logic in calls for a merit-based immigration policy? Because that also functions in a similar way: As in, those immigrants who have desirable traits get admitted while those without them get denied entry and are thus often condemned to lifetimes of poverty, misery, and/or oppression.