There are a few reasons why the book And to Think That I Saw It on Mulberry Street might be banned. The first reason is that the book is about a child who tells a story that is not true. This can be interpreted as the child being dishonest. The second reason is that the book includes references to alcohol. Specifically, the child in the story sees a man who is drinking wine on Mulberry Street. This could be interpreted as encouraging alcohol consumption. Finally, the book includes references to violence. The child in the story sees a man who is beating a drum. This could be interpreted as encouraging violence.