What is Le's purpose for re-introducing Boo Radley in this chapter?

There is a complete change in how Scout now views Boo. After the injustice of the Robinson trial, the innocence and immaturity that made Scout make up stories about Boo is gone. Scout has lost her fear of the Radley place. Every now and then she daydreams about seeing Boo sitting on the porch, and greeting him as if they spoke to each other every day.