Fascinating article here: The Invention of Moral Narrative. The argument is that in our culture, the most popular stories have two things in common. First, they pit a band a good guys against a band of bad guys. We are supposed to root for the good guys and cheer as they fight against and defeat the bad guys. The high point comes when the bad guys, or at least their leader, is killed.
Second, the bad guys always have massive advantages to start off with. The good guys are heavily outnumbered and outgunned. The bad guys are extremely organized with a regimented hierarchy, numerous levels of leadership, and vast resources. The good guys, by contrast, are a small band, disorganized, without much in the way of weaponry or technology or leadership. But they are scrappy and resourceful and courageous, and eventually they win.
It’s easy to name examples of stories that fit this description: Lord of the Rings. Star Wars. Harry Potter. The Avengers. The Hunger Games. Almost any James Bond movie. Avatar. The Matrix. The Lion King. The Lion, The Witch, and the Wardrobe. Independence Day. All the Indiana Jones movies. Even The Wizard of Oz fits it perfectly.
So there’s the question of why there is. Was all entertainment always like this? There are some cases from centuries ago that arguably were (e.g. Robin Hood) but many were not. The article presents some theories, but I’d be interested in hearing more.