JFK
This isn't just a film about the investigation into the assassination of JFK. Despite it's uniquely American identity, Stone's masterpiece tells a story that transcends the United States. This is a film about a man going up against the most mythical of all evils, that exists on such a scale that it dwarfs the murder of the president. This is a film about a man investigating the ultimate mystery, which isn't "who killed Kennedy?", but rather a question so important, so grand, that to even propose it seems ridiculous: who is responsible for corruption? Corruption full stop. Not just the corruption of the American government that is on full display here, but the corruption that exists rampantly throughout the entire world as we know it.
Say what you will about the real man and the investigation this film is based on, but strictly within the confines of this film, Jim Garrison is going up against the very concept of corruption itself. The way Costner's voice keeps breaking during the climax, a tear streaming down his face. That shit is real. The weight of the situation isn't attributable to only the amazing filmmaking on display. It's because it's real fucking life.
It's an unsolvable question. This is too fucking big for us don't you get it? It's a mystery. It's a mystery wrapped in a riddle inside an enigma. The fucking shooters don't even know, don't you get it? It's up to you.