I think that the song is about the immense happiness and sense of power that can be achieved through freedom, and about having no fear.
It is obviously, as xziar has already said, inspired by Harper Lee's To Kill a Mockingbird, in which the lawyer, Atticus Finch, defends a black man accused of raping a white girl. I think that his character is used because he stood up against an issue that normally would have been simply accepted, and then moved along, which makes him brave and fearless, the feelings that I am getting from this song.
I think that the song is about the immense happiness and sense of power that can be achieved through freedom, and about having no fear. It is obviously, as xziar has already said, inspired by Harper Lee's To Kill a Mockingbird, in which the lawyer, Atticus Finch, defends a black man accused of raping a white girl. I think that his character is used because he stood up against an issue that normally would have been simply accepted, and then moved along, which makes him brave and fearless, the feelings that I am getting from this song.