Its a highly risky shot, and most archers are not good enough to do it on purpose. There is an area just below the spine that if hit, only wounds them. Also, if you've ever spined a deer, its fucking awful to watch them thrash around trying to get up. It breaks my heart.
I think its unethical, and is an attempt for the hunter to be uber lazy and not track a deer. If you can't put a kill shot on a deer, don't hunt. Period.
Bad things happen out there, and spining them does happen to everyone, hopefully their prepared to finish it off quickly.
I'm shocked that a tv show would include something so controversial and horrible to watch in their programming? Crazy.