The postcard idea (that everyone needs encouragement) is powerful and clever. I'm sure some teacher will assign a project like it to students after they read the book. I'm less comfortable with the idea that we should not judge others. While most bullies have become the way they are because of how they themselves were treated, it's simplistic to imagine that you can break the cycle with kindness and understanding. With much of the bullying in this book (Vincent being the notable exception) coming from adults against children, this is particularly disturbing. It's an ambitious idea for a story, but I'm not altogether comfortable with the idea or its delivery.