maryz - I don't know. Isn't it through discussions of this type that we are able to consider "what if" and develop our understanding of these things?
I agree it is difficult to be certain how you would act when it is a hypothetical situation, not a real one actually affecting you, but that desn't make discussion of the matter less valid. We kow that sometimes in the "serility of our castle" we can make judgemnets on what we believe is the ethical desicion - and that if we were out in the real world having to mkae that decision the descion that we make may not be the one we think most ethical - just the one we want to make.
For example - murder is wrong/unethical/a bad thing. Would you kill someone is it meant saving the lives of your family? The ethical answer is OBVIOUSLY no - murder is wrong. However, lets face it - my family are FAR more important to me than some nameless, faceless stranger. If I had to choose between the value of their lives I would come down on the side of my family every time. And if it was necessary to take action to preserve the lives of my children, then yes, I may well do it. But it wouldn't be the ethical choice.
SO whilst in a way I agree with you, we don't know the situation first hand, so it is hard to comment on what we would actually do, that doesn't make our opinions on the subject (positive or negative) not worth hearing. It helps us decide in our minds what we believe we should do if this situation ever were to come upon us. Though that may not be what we actually would do.
Does that make sense, or have i started to ramble?