What are some good pieces of evidence proving that Dill is the main symbol of innocence in To Kill a Mockingbird?I basically have "he's always...

I totally agree that Dill is the main symbol of child
innocence in To Kill a Mockingbird, but, I would disagree that Dill
is always happy. He is certainly not a happy boy when he runs away from home in Chapter
15. This action does give additional evidence of his lost innocence, however. At first
excited about his mother remarrying, his new father proves to be a cruel man, if you can
believe Dill's extreme exaggerations, who chains him in the basement. Dill escapes the
torture by making the long trek alone from Meridian to Maycomb. It is another example of
the abuse and unhappiness that is heaped on Dill at such a young age, and the steps he
will take to return to the one place where he is happy. Additionally, Dill has yet to
understand that Scout and Jem don't believe his tall tales, which are meant to deflect
the reality of being a child whose parents have no time for
him.

Dill's innocence can be seen again during the trial,
when he begins crying and has to leave with Scout because of the prosecutor's callous
treatment of Tom Robinson. Dolphus Raymond recognizes that Dill is still a child who, in
a few years, will no longer cry when he sees hatred perpetrated against another;
experience in a cruel world will change all of that, he
suggests. 

Previously, Dill's innocence can be seen in his
fascination with Boo Radley. Dill believes all of the stories he is told about Boo, who
he compares with a monster akin to Dracula, the movie that he has so proudly
seen.