We hide things for fear of rejection. To discover acceptance. To reconnect as fear is replaced with love. Other species get depressed when alone.
Humans do that but also get depressed when goals are achieved.
This oddity is inexplicable. People get depressed when goals are met because they discover the goal was not the goal. The receiver ran in the wrong direction to score for the opponent. Intellectual goals score for competitive individuality and leave the participant alone in enemy territory. Intelligent goals connect people together in support and end with opponents united.