But would you refrain from pulling the lever because you thought that it was the wrong thing to do, or because you simply couldn't bring yourself to do it?
Personally, given a limited amount of time, I would probably not pull the lever, I simply wouldn't be able to make that important of a decision that quickly. I'd probably hesitate too long, hoping that someone would do something, only realizing too late that that someone had to be me.
On the other hand, given that this is only a hypothetical, I believe that the right thing to do is to pull the lever. Life isn't perfect, and right and wrong aren't always black and white. We have to make choices and we have to live with them. I have to kill someone, because as much as I want to, I can't save six, I just can't. But I can save five, and if that's wrong, then that's wrong. I'll have to live with it. Life does that, it gives us things that we just have to live with. You do the best you can, you save as many as you can, and you regret the ones you lose.