Here is a small selection of children’s books that I personally find helpful and perhaps hope-inducing without trying to hammer a moral lesson into your head, which could be not only painful but counter-productive.
(The links are to Indiebound.org, but of course you can find or order these books at any other bookstore or library.)
Arnold Lobel
Grasshopper on the Road
http://www.indiebound.org/book/9780064440943
Leo Lionni
Little Blue and Little Yellow
http://www.indiebound.org/book/9780688132859
Tony Kushner and Maurice Sendak
Brundibar
http://www.indiebound.org/book/9780786809042
Jo Hoestlandt and Joanna Kang
Star of Fear, Star of Hope
http://www.indiebound.org/book/9780802775887
Tomi Ungerer
Otto: The Autobiography of a Teddy Bear
http://www.indiebound.org/book/9780714857664
Ruth Krauss and Crockett Johnson
The Carrot Seed
http://www.indiebound.org/book/9780064432108
William Steig
Amos & Boris
http://www.indiebound.org/book/9780374302788