The Butter Battle Book

So I went to the library Saturday to get 4-yr old some books and return the old set. I refuse to buy books right now unless they correspond with a college course. So far it's worked out okay, and we've come across some interesting finds. I usually get one or two books he can read or read with some help. I get one book specifically for the art, which I end up reading to him. And if I'm fortunate enough to find a fourth book, I'll pick something out that's part of a familiar character/TV show, etc. For instance, time before last the fourth book was one in the Dora series.
The book that fit the fourth book category this time was Dr. Seuss' The Butter Battle Book. I thought the cover looked inviting - orange - and the pictures looked interesting. But when I got it home and read it to him, I was shocked and taken aback. This IS NOT a children's book. This is for teens or people studying war. It was hard for me to get over the last page. For me, I understood what this book was trying to convey. For him, the ending was unsatisfying. I'm sure he was thinking, "What happens next, Mom?"
My suggestion then, is to borrow this book and read it for yourself. If you think you can translate the message into something your kids would understand, then go for it. But it is not a book for small children. In fact, I looked it up on Wikipedia and the book was actually banned for awhile. I previously checked out Dr. Seuss when studying WWII. Dr. Seuss did a lot of marketing for the U.S. government. If you want to see some of his wartime work, type in "Dr. Seuss, WWII" in Google Images. They are really interesting. But it is a bit odd looking at his drawing of Hitler...