We're hammering a handful of topics here:
Albert Mohler has some telling existence proofs against the notion of removing "personhood" from people.
The first story is recounted in a newspaper article. Imagine facing someone you declared not a person...
This topic was actually covered in Star Trek V (I know, an odd numbered one, but probably the best odd numbered one... not that that is saying much). Bones pulled the plug on his father, when the cure was discovered the next week. He never got over the guilt, and an evil Vulcan terrorist used that guilt to take over the Enterprise to go visit the god at the center of the galaxy! Stop the madness!