I'm missing something, maybe, but on 1) I have a choice between killing 5 and killing 1? No time to untie means no time to get to know them, also, it's likely going to be a fast, pressured decision. Where's the moral dilemma in that? One would kill 5 to save 1?

Also, what is this about inaction? Inaction is tolerable when you are surrounded by 500 people and one guy smacks his gf upside the head. I'm not going to set things straight and frankly it's not like she's kidnapped. She chose him.

But really, you're the only one there, and you have the switch. Whatever happens rests on you. This is not the time for inaction. If you don't act, you've killed 5 people by yourself and your inability to make a decision. If you do, you've saved 5 and the one that died you didn't kill. They guy who tied him to the tracks did.

How is throwing the switch murder? Is the second to last piece in a domino responsible for the setup collapse?