i was trying to think of some trick to save everyone, but if its basically would you take action if it meant four more people being alive than if you hadn't, then i'd rather have one death on my conscience than 5. not taking action wouldn't absolve you of guilt when you know you could have saved them...

now if the 3rd alternative was to throw my n900 on the tracks and save everyone, that really would be a moral dilemma!