Those who think it's wrong, let me ask....are you willing to adopt these kids then? Once they're born with major heart defects, Vision problems hearing loss, infections, Hypothyroidism, blood disorders, hypotonia (poor muscle tone), problems with the upper part of the spine. It's not just a question of having learning disabilities.
Someone used that lass with downs syndrome who went to court to challenge the law. It must have greatly upset her and it's not something she needed to know. Highly doubtful she found out through her own research.
In the UK it's extremely difficult to find adoptive parents for heathy boys over 3, let alone a downs child. They'd face a life of being in state care and as one who was in care for a while I can tell you it's horrific. When my babies were tested for downs (being an older mother) I had to seriously think about how they would manage after I died. The thought of their lonely struggle. There's many in an adult care facility on my road. Most of them get no visitors of their own (who aren't home volunteers).