[Houshalter]

True, but the result is the same whether the child was "picked" from an embryo with a disability or if he was born fine and then the parents injured him in a way that gave him the disability, which would be considered totally despicable and illegal.

[simonh]

No, the result is not the same. It's a choice between life with deafness, or death as an embryo so that a sibling can live instead.

[Houshalter]

The result is a sentient being with a disability. It doesn't matter if a mutation caused it or you physically injured the child, the consequences are the same.