BioShock 3. Game establishes that it is a multiverse. There are many worlds/universes, but there is always a girl, and always a light house. You did something bad and it caused suffering. At the end of the game, you go back and change something, and create a bright happy future. Everyone sings Kumbaya (literally they play a song called break the cycle). The idea is that there was a single event and everything bad happened because of that. Going back and stopping it prevents all the bad stuff. The problem is, that only works with “Back to the Future” style time travel. The game already established it is a multiverse. So yes, you did create 1 future where everything didn’t go to shit. But because it’s a multiverse there are still an infinite number of universes where things are still very bad, and there is suffering. For whatever reason the writers just didn’t think about that I guess? It seemed really asinine at the time I played it.