What's the point of saving human's imagination and creativity?

susan: Now, tell me...
grandfather: What would have happened if you hadn't saved him?
susan: Yes
grandfather: The sun would not have risen
susan: Then what would have happened?
grandfather: Coming out a ball of flaming gas would have be illuminating the world?
susan: All right, I'm not stupid. You're saying that humans need fantasies to make life bearable
grandfather: No, humans need fantasy to be human, to be in the place where the falling angel meet the rising ape
susan: With tooth fairies, Hogfathers?
grandfather: Yes, that's a practice you have to start out learning to believe the little lies
susan: So we can believe the big ones?
grandfather: Yes, justice, mercy, duty...that sort of things
susan: They are not the same at all
grandfather: You think so? Then take the universe and grind it down to the finest powder and sieve it through the finest sieve, and then show me one atom of justice, one molecular of mercy. And yet, you try to act that as if there is some ideal order in the world, as if there are some...some rightness in the universe by which it may be charged
susan: But people would got to believe that, or what's the point?
grandfather: You need to believe in things that are untrue, how else can they become?

So, in one word, may I say that imagination is an essential part of humanity which brings us hope and creativity? And as far as I'm concerned, yes, I believe so.