I look forward to sharing your thoughts
Was the person being 'electrocuted' aware of the rules and process of the game?
If not, this is where I think it becomes unethical. However, if he was privy, and agreed to it (providing he was in a mental state that could comprehend this), I don't think there is an ethical issue with this.
The contestants thought they were electrocuting someone, but unbeknown to them it was an actor who was just acting like he was in pain each time they tried to zap him.
Incidentally this is from the Milking the devil inside
post I think, however their are definite similarities with politics in the deception and cruelty!