Why would that matter?
Well, five people were careless enough to put their lives at risk, but just because they outnumbered the one who had a care for his own safety, he should suffer for it? That was my line of thought behind saying that regardless of the number of people on the tracks he should just take the one that the trolley was intended to go on in the first place.
Why should evolution be a consideration?
It shouldn't, that was beside the point, sorry. But one person was out of harms way to begin with. He isn't in danger because a train is supposed to go where he is standing. He is in danger because there are five people blocking the path of the train, forcing the driver to consider alternative routes.
So I guess Edward could change tracks, kill the one man and put the blame on the five who were on the tracks. But if so, why shouldn't he just run over the five? People should pay for their own carelessness. It shouldn't be inflicted on others.
The question is whether Edward is blameworthy, not whether someone else might share in the blame.
I'd say Edward is blameworthy only if it was within his power to keep anyone from getting hurt. It seems to me that in this case that is not within his power, unless he knew the breaks were not working before he put the train in motion.
Good questions. How would you answer them?
I don't think there are any easy answers. If I had been forced to make such choices I would have wanted as much information as possible. But the information wouldn't necessarily be to make the right choice, but more to justify whichever choice I did make in the end.