what is the turning piont in Stuck in Neutral by terry trueman?

The whole point is that just because someone is disabled, doesn't mean that they can't think or feel or that they aren't smart. I mean they could be, but obviously the guy in the book isn't. Then there is also the debate of what to do about it on the parent's part. On one hand they might wnat to put the poor kid out of his suffering (like the fatjer) but then again, what if he's not suffering?