The example in the story sounds like the doctor had a picture of his grandkids in the bath tub, so of course there is a grey area and it’s terrible if someone is arrested for that. I think that falls under poor discretion and/or badly written laws. It doesn’t mean that you shouldn’t report real “you know it when you see it” porn involving children.
Also, how stupid do you have to be take a computer full of child porn to be repaired at Best Buy?