Scout, Jem, and Dill all are leading fair lives. All sem to have had some sort of education, and all have grown up as the dominent race in the racial south at the time. I do see that in the book Dill questions Jem’s authority as the leader of the group. It’s obvious that Boo Radley could represent fear, but to me I wonder if that is too obvious. Boo Radley still remains mostly a mystery throughout part 1; I think that we will see more of him in part 2.
As an idea to throw out there, it’s possible that Boo Radley represents misunderstanding. I don’t know how if that’s right. There was racial tension when talking about Boo earlier in the book, but that could be just gossip from the local townsfolk. Boo Radley will be explained later in the book.