Thomas Kinkade, the bestselling American painter known for idyllic cottage scenes, had a troubled life that contrasted sharply with his saccharine art. Despite earning over $100 million annually at his peak, critics dismissed his work as schmaltzy and forgettable. A new documentary reveals the "Painter of Light" harbored a dark, tortured persona beneath his wholesome image. Kinkade died in 2012 amid business struggles, leaving behind a polarizing legacy.