Craig,
I agree with you, that "do unto others" plays a very important role for Christians. And I agree with your stance on why you wouldn't.
I didn't mean to quote Bible verses to imply that because this is the reason I would do it, that others should, too. That's why I think this is such a good question, because it's one of those questions that we have to decide on our own.
I think conscience and personal decisions should play a larger role for Christians than written guides (including Bibles). It's one of the things that makes the "golden rule" such a core Christian concept. "Do unto others as you would have them do unto you" is a positive expression of Christian love that gets right to the heart/conscience. For me it might make me consider a different answer than it would make you consider. I look at it and say, yes I would rather have someone try to save me in the best way they know how rather than let me die for my own idealism. To the JW, I basically "raped" them (their words), but did not destroy both "soul and body."
I didn't mean to make this a discussion of Christianity, except to show that there are potentially Christian reasons that a JW should also understand. And again, I'm not saying I think it's in any way unchristian for anyone else to let them die with their dignity. If the golden rule and Christian love motivates you to let them, then you did the Christian thing. For me, for now, if the golden rule and Christian love motivates me to act -- then I also did the Christian thing.
Gamaliel