First time watching this in like, 6 or 7 years. Didn't fully appreciate it the first time, but now I'm convinced this is Bong Joon-Ho's take on "The People Who Leave Omelas" by Ursula K. Le Guin.
"The train is the world and the people, humanity". They literally spell the class struggle out for you, but they don't need to. It's a revolution of the lumpenproletariat.
Namgoong wants to destroy the frozen gate, ending the exploitation altogether. Curtis is afraid…