Edit: apparently this is a very common form of Japanese storytelling called an isekai. There are 8 billion people in this world, no idea can be original. And sometimes you miss out on things many other people know. I’m clearly one of today’s lucky 10000.
Most cultures don’t immediately leap to “better kill everyone else in the train so I can take their stuff.”
Some don’t, I’m not sure about “most”. Regardless, I’m not waiting around to see what kind of passengers I’m traveling with. If everybody plays nice and works together then that’s great, we all have a better chance for survival. You still need to protect yourself against any hostile natives or wildlife because everything you know about what’s safe and what’s dangerous just went out the window.