I remember years ago, when I had three small children around my feet, listening to a radio discussion about the difficulties of looking after seriously disabled children (not all were Downs Syndrome). It was not about abortion, but about how exhausted and frazzled the parents were, and about how marriages were being damaged and other children suffering.
Most of the mothers spoke about the stresses of being alert 24/7 to the disabled child. One of them would lay the child in a protective playpen in the garden surrounded by toys tied to the rails while she did essential chores - and had been criticised by a neighbour for "imprisoning" him. Another spoke of having to make older children independent far too early because it took all her time to see to the disabled one. All were doing their best in a difficult situation, but told how they were suffering and unhappy in their situation.
All except one. Her first child was very seriously disabled, and needed constant attention. She had made the decision to have no more children, and give up her carer, and devoted herself entirely to him. She insisted that it was a blessing and a privilege, that she was entirely happy, that she could not understand how the rest of them could complain at their lot. I waited for someone to point out that they were already responsible for a family when they were "blessed" with a disabled one, but strangely no-one did.
One persons burden is another person's chosen task. Morality is a minefield which RD should keep out of.