Consider though how that makes him and Batman two poles of the same thing: making the best of loss. In Batman's case it's from a negative angle(make people not die) and Superman's it's positive(help people live).
Another interesting thing, to me, is the basic real-life currents they come from. It's been said that Superman represents the dream of the immigrant, to have come from a destroyed place, and in the new place you find out your true potential, and become useful and even great. Batman is the fear of the urban dweller, which can be distilled down into subjective, personal loss. Superman comes from the loss of cultures, of nations, coming from cultural memories of genocide and endurance. Batman is local and personal and individual.