So can fostering feelings of connection and nurturing positive skills—as opposed to just limiting negative thought patterns—reduce suicidal plans and death fantasies? 

This is a great question and at the heart of what positive psychology aiims to serve. Normal is not enough. Thriving is the goal. While we have many tools that have truly helped in targeting suicidal ideation, The Greater Good Society explores how positive emotions can be leveraged in treatment of depression and suicidal ideation. 

While it is easy to make fun of the “turn the frown upside down” approach and scoff at “happy therapy” when it comes to treating very real mental health issues, the article does highlight two key studies targeting Graitutude, Grit and Forgiveness.