A shark who wants fish to be friends, not food, is a good joke from Finding Nemo, a big budget movie that came out in the same year this sloppily illustrated, generally unfunny book came out. This book has that same joke as its whole premise, but somehow doesn't address the fact that sharks kind of do eat fish, so maybe it's not unwise of the fish to be wary of the Smiley Shark.
Leads your small children to emotional identification with the shark, which is perhaps confusing for all parties.