This is actually a really interesting one! It questions your faith in humanity. All everyone has to do is not pull the lever. If the remaining population of humanity is on the 33rd switch, then just 33 randomly selected people all have to not choose to kill anyone. But can you trust such a huge decision to a stranger? Will the person further down the tract trust them or kill more people to safeguard humanity?
Personally, I think one life is worth sparing humanity this risk of annihilation. I could live in a world where my life might be randomly sacrificed to safeguard humanity if it only happens once.
Ah, but that’s by design: it also acts as a soothing white noise machine.
Then you might point out the exhaust and all it’s associated wastes, but that’s by design: it produces a heady and aromatic product for recreational huffing.
Then you might point out the vibrations, but that’s by design: the engine also provides invigorating massages to relax taut muscles.