The same reasoning that is used to promote killing a disabled person before birth can be used to promote killing a person who acquires a disability (through injury or illness) later in life. And it already is.
“Who decides?” Start by asking, “Who pays?”
Jesus is at a school for children with Down syndrome, and He is holding a little girl. Jesus says:
I know what you are thinking. You need a sign. What better one could I give but to make this little one whole and new? I could do it, but I will not. I am the Lord and not a conjurer. I gave this mite a gift I denied to all of you — eternal innocence. To you she looks imperfect — but to me she is flawless, like the bud that dies unopened or the fledgling that falls from the nest to be devoured by ants. She will never offend me, as all of you have done. She will never pervert or destroy the work of my Father’s hands, as you have all done. She is necessary to you. She will evoke the kindness that will keep you human. Her infirmity will prompt you to gratitude for your own good fortune … More! She will remind you every day that I am who I am, that my ways are not yours, and that the smallest dust mite whirled in the darkest spaces does not fall out of my hand … I have chosen you.