The train question has always annoyed me. It's a fantasy world where you kill and save people by pulling a lever. And after the you answer, people add more rules, like "you may have to face jail time if you deliberately kill anyone". What about negligence? Call me obtuse, but no one could convince me yet that not pulling the lever is the right option. Does it detach you from the problem? No, you still took an option…
It's not a fantasy - you kinda had a similar situation on 9/11 with United 93. In that case, the passengers brought it down before a decision could be made, but in case they didn't, the moral question would be nearly identical. There's a plane full of people that got hijacked and will definitely be used to cause even more casualties. You know that the people on the plane are going to die anyway. Would you really shut…
Where I in the hypothetical train scenario, I would not pull the lever. Because in truth, I don't know that the five people will be killed. One of them may look up in time, shout, and all of them scatter. But the one loner? He may be too absorbed in his task.
The details in these kinds of things really matter. They make or break the morality of the scenario. And the details in the train & lever scenario are implausible. The supposed level of certainty is too high.