From what I remember, the secret to happiness/story about Kotti was about the community coming together to stop a woman from killing herself because she was getting evicted. The people stood up to the police, and kept protesting until Nuria the woman was allowed back in her home. In the end what Johann Hari talks about is how the sense of community is what helped fight the power system just to aid the well being of an individual in the community. If you are in a connected community, bringing awareness to any depression or health problems can help bring massive change.