Personally I think it is okay that narratives like Star Wars and Lord of the Rings have a happy ending when a single Bad Guy is defeated because stories are metaphors and not meant to reflect reality
Blowing up the Death Star is enough to win because of what the Death Star represents, not what it actually is
Fantasy stories are usually concerned with exploring some other concept and just using stopping an evil empire or whatever as a backdrop and excuse to put the heroes in motion so they can engage in the metaphorical warfare with whatever their actual problems are.
The Empire exists in Star Wars so Luke can struggle with the concept of Balance and learn to be self-reliant as he comes of age by fighting against it.
Sauron exists so Middle-Earth can struggle with the rise of technology vs pastoral life.
@witchfynder_finder I think this also has to interact a bit with the backdrop of WWI/WWII - obviously a lot of the thought behind LOTR was pre-WWII and the author said it was a lot more about tech vs pastoral life (though WWI really colors that conflict!!!), but you really can't help but think the second war throws a lot of shade on the final portrayal. And Star Wars is deliberately about space Nazis.
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