Because that's where answers to real problems lie. When we are stuck in reality and refuse to let our imagination transcend our experience, we'll never solve problems. It is imagination that holds the key. And that's what art and literature are all about. We imagine a better world, and if we can dream it, we can do it.
Imagination is for self-improvement.
Thoughts lead to actions. But dreaming is also doing. The act of imagination can sometimes have more power than any technological weapon. It is imaginations that stop wars. It is art fulfilling its role in society.