Errr.... Moral ethics in hypothetical situations give me a head ache.
Due to the simple fact that people severely underestimate or overestimate their response in foresight. That is, once you're actually in that situation as unlikely as it is, to what extent will you fulfill what you say now. Also it's the internet, and everybody loves to use internet logic, most people will choose the most 'logical' answer and completely dismiss their emotive response, you'll think "Hey one life is worth ten lives" which seems reasonable enough... for now. You'll of course leave out the other dozen or so factors that would influence your decision, such as legal issues, is your job on the line?, does this man deserve to die, do the other people deserve to live, to what extent will this man suffer in the process, what about the families etc. This ladies and gentlemen is called presentism.