Why does Jem and Dill both want to reveal the secrets of Arthur Radley by touching his house and looking through the window, and passing a note into the window?

Jem and Dill hatch a plan to leave a note for Boo in the Radley's window, using a fishing line. The note will ask him to come out sometimes and tell them what he's doing inside, and that they won't hurt him and will buy him ice cream. Dill says he wants Boo to come out and sit with them for a while, as it might make the man feel better.

Cool...