because atticus already warned them about bothering the radleys. and scout is scared that boo will come out and attack the kids if he notices. scout is being "A girl" as jem puts it.
jem scout and dill
Jem does after Scout and Dill dare him to.
BOO RADLEY
Dill, Scout, and Jem frequently like to play the "Boo Radley" game, where they reenact stories and legends about their reclusive neighbor, Boo Radley.
Jem and Dill first took Scout into the Radley yard the night before Dill was supposed to leave Maycomb for the schoolyear. However, Lee does state that Scout "rolled into the Radley front yard" earlier in the book when she Jem and Dill were playing with an old tire.
Dill, Jem and Scout act out Boo Radley's childhood.
Boo Radley's life
She was in a tire and was rolled into the yard
Jem touches the Radley house despite the warnings from Atticus not to go near it. This action shocks Dill and Scout because they know the house is considered haunted and belongs to the reclusive Boo Radley.
In Chapter 4 of "To Kill a Mockingbird," Jem, Scout, and Dill start playing the "Boo Radley game." This game involves reenacting stories and rumors they have heard about their reclusive neighbor, Boo Radley.
In "To Kill a Mockingbird" by Harper Lee, Jem, Scout, and Dill play a game called "Boo Radley." They act out various scenarios and create stories based on the mysterious neighbor, Boo Radley, who they have never seen.
In addition to Scout, Atticus, and Alexandra, Jem's room also houses Dill. Dill comes to stay with Jem and Scout during the summer months, and the children often have adventures together.