What outcome results from the Society's victory against Mr. Curtain?

The outcome that results from the Society's victory against Mr. Curtain is that it leads to freedom for the mind-controlled children and a return to independent thinking. This choice captures the essence of the Society's mission throughout the story, emphasizing their focus on liberating those who have been subjected to Mr. Curtain's manipulative and oppressive tactics.

By defeating Mr. Curtain, the Society not only dismantles his plans but also restores autonomy and the ability to think freely to the children affected by his schemes. This is crucial, as the children's regained independence serves as a powerful testament to the Society's dedication to critical thinking and the importance of individuality. In the narrative, this act of freeing the mind-controlled children underscores the broader themes of resistance against tyranny and the value of intellectual freedom, which are central to the overarching plot and character development.