I was a late-life child. High risk for Down's. My mother didn't get the test, which could've introduced more problems. She believed I was already alive, because I was, and I was therefore sacred to her, and the outcome of the test would be irrelevant to her choice. Notice in all of this, I didn't have a choice.
I'm glad she didn't abort me. If I don't want to be alive now, now it's my decision.
I guess you can keep arguing that killing unborn children diagnosed with Down's isn't eugenics but my perspective is pretty heavily informed by the fact that I'm alive thanks to my mother being bothered by the idea that she might kill me in utero if I had a developmental disorder.
I'd like to see you explain the position that a baby diagnosed with Down's should be aborted to someone with Down's, frankly.