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There certainly are precedents. A well-known (in Russia) sci-fi novel has a twist ending where it turns out that an ostensibly evil opponent was actually a high-placed agent in the enemy ranks, hi...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/46800 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There certainly are precedents. A well-known (in Russia) sci-fi novel has a twist ending where it turns out that an ostensibly evil opponent was actually a high-placed agent in the enemy ranks, his efforts to capture the protagonist were meant to protect him, and the protagonist's actions at thwarting the Evil Plans made things worse. If a plot works in sci-fi, why not in dark fantasy? Though making the goal _trivial_ instead of _as grand as it seemed, but good instead of evil_ might let the reader down.