And no one talks about adults with Down’s.
I don't know about no one, but there is certainly a tendency to concentrate on cute, pre schoolers rather than adults.
A good friend of mine has a relatively high functioning but not independent living DS brother. They, along with their other brother, are all in their 40s now and he lives with his parents who are pushing 80 and getting increasingly frail.
The parents are deeply religious and expect my friend to take on the care of her DS brother when they are gone. She has repeatedly, for decades, told them this will not be happening and encouraging them to look into residential accommodation for him. They just tell her she'll 'change her mind' (she won't). She loves her brother but he can be aggressive and is easily twice her size. And as of now he doesn't show signs of Alzheimer's but who knows what the future holds?
Oddly enough the parents have never once asked other brother if he'd be willing to take on the task. Funny that.
When deciding whether to continue a pregnancy it is the whole life, not just the baby bit that has to be taken into account. Many situations involve life long care, and where there are siblings involved their needs also have to be taken into account. Nobody should be called names for not wanting that for their family.