However, you might be asking about a particular interpretation of the story that presents it as evil. In that case, the conclusion could be:
* A pessimistic outlook: The world remains dangerous, with dark forces still at large. Harry's victory is temporary, and the battle against evil is never truly over.
* A cynical view: The power of love and friendship is insufficient to truly defeat evil. Ultimately, the world remains a flawed and unfair place.
* A nihilistic interpretation: The story's ending is meaningless, as all actions are ultimately futile against the inevitable forces of darkness.
It's important to note that these interpretations are not the intended message of the story. J.K. Rowling has stated that she believes in the power of good, and that the story is ultimately about hope and resilience.
Ultimately, the conclusion you draw from any story is a personal interpretation. The "evil" conclusion is a possible interpretation, but it's not the only one.