“Why does the third of the
three brothers, who shares his food with the old woman in the wood, go on to
become king of the country? Why does James Bond manage to disarm the nuclear
bomb a few seconds before it goes off rather than, as it were, a few seconds
afterwards? Because a universe where that did not happen would be a dark and
hostile place. Let there be goblin hordes, let there be terrible environmental
threats, let there be giant mutated slugs if you really must, but let there
also be hope. It may be a grim, thin hope, an Arthurian sword at sunset, but
let us know that we do not live in vain.” — Terry Pratchett, “Let There Be
Dragons”