your post seems a bit condescending, but i'll bite.
of course it's a shitty situation. it's an accident. my definition of morality is not always based on outcomes, so it it has nothing to do with being absurd. i absolutely don't care that lots of people would choose to save the five people.
the failing brakes on the train are not the engineer's fault. i'm assuming the engineer did not tie the five men to the track, so why should he be responsible for the accident? why is the life of one innocent less important than five? ten? a million?
try to consider the people on the end of receiving end of such a deal if you were to divert the train and kill the one man. would you like to explain to his family that you by your own hand killed this man because his life was worth less than the other five? that seems like a slap in the face. you should be charged with murder because the moment you decide to switch tracks and kill the innocent man it is no longer an accident.
random bad shit happens to people everyday. i don't think that anyone gets to mitigate that damage by harming others. now if there were no one on that other track i'd feel the engineer was obligated to switch directions.
there would be no reason to tell the single man that five people died to save his life because that just isn't true. the five people were in the wrong place at the wrong time not him. if the men were to switch places in the loop back diagram and only if the engineer were to decide to switch tracks would the five men "be saving his life."
since we've decided to get personal, i'll say that i am only willing to take responsibility for the things i actually do. i try not to take responsibility for things beyond my control or for conscious inaction. otherwise it would be my fault for not feeding seventeen starving children in Africa, and all billionaires would be required to donate all their money to the masses. just because you can do something doesn't mean you're morally obligated to do it.
to me killing the one man to save five is using an innocent person as a means to and end. i got into a huge fight with the husband over this because he claims that it's not the case. how is it not?