My sil had a massive stroke, and at the beginning one half of her body was entirely paralyzed.
Now, about two years later, with therapy, she is walking and her arm is coming back.
This is not the time for John's family and friends to lose heart. Many folks come back greatly from strokes.
I know it is tough for them, but they are lucky to have friends like you.
Best of the season to them and to you.
Before criticizing a person, walk a mile in his shoes - then you are a mile away and you have his shoes!