And then there's some psycho on round 34 who kills all 8 billion people alive on earth.

Eventually everyone is tied to the tracks and there’s no one left to change the trolley’s course.

The real questions are, "Who is fueling and piloting the trolly, and can we kill them?"

But it only takes 1 idiot to ruin the whole thing.

This is really the only answer. The only thing that makes it "hard" is having to face the brutality of moral calculus

Some day it reaches a person that thinks...

Well, 4 billion people less is better than someone being able to wipe out humanity...

(it would also solve many problems lol)

(and that point would be after 32 people had the choice...)

Eventually there might also be a track with no people on it so postponing the dilemma becomes much better than at least 1 death. But there is no way of knowing what the future dilemma might be.

At some people you will run out of people to tie to the tracks.

Might hit the 2nd guy with a lever and the peeps behind him depending on speed.

Attempting to subvert the thought experiment only makes things worse. The trolley is full of child prodigies, all future geniuses that will cure cancer and solve the world's problems. By sticking the lever halfway you kill all of them. The only way to save the child prodigies is to choose, left or right.

I forget where it was from but years ago I found an online survey on autonomous cars and their decision making from a university. It was all about deciding to swerve or not in a collision. All kinds of difficult encounters like do you hit the barrier and kill the passenger or swerve and kill the old lady? Do you hit thin person or serve and hit the heavier person?

I've never seen a survey drill down into biases quite so deeply.

Year 2k38, right?

You don't even need a lunatic or mass murderer. As you say, the logical choice is to kill one person. For the next person, the logical choice is to kill two people, and so on.

Well what about the fact that after 34 people the entire population is tied to the tracks. What are the chances that one person out of 35 wants to destroy humanity?

Also thing the entire human population to the tracks is going to cause some major logistical problems, how are you going to feed them all?

Switch the track from the bottom to the top as the train is half way over the switch, causing the train to drift across both rails hitting all three tied up people and the second switch operator.