The theme for The Secret Life Of Walter Mitty might be the death and destruction of mankind as human being are become prey of unproductive attitide and the exceeding wishes when cannot be pursued they seek refuge into the world of fantasies to become the ones they are not it shows the declining standard and productivity of human race which ultimately becomes the death of them.. walter mitty being a sole character represent mankind as a whole and in actual represent the hidden desire of every sole to break free.