Mockingbird questions #4

The theme that i think most comes out in the story, to Kill A Mockingbird, is justice vs. injustice. I thought this was a big theme in the story because there is a lot of racism in the book where white people for the most part get their justice and black people are treated unfairly. For instance when Jem, Scout, Dill and the Reverend went to the balcony to sit and watch the trial "Four Negroes rose and gave us their front-row seats"(page 164). This shows injustice because that is how all black people are supposed to act and it is frowned upon when they don't. They should be able to sit where ever they want to and not have to give up something like a seat in the front row, but this was how it was in that time.
Another example of the theme justice vs. injustice is when Tom Robinson is convicted of raping Mayella Ewell. I think Mr. Ewell is the one who beat up his daughter and there is no proof that Tom did it, and the fact that he is black is the only reason why he was even sent to jail. This kind of shows it's self when the narrator says "All...that made him any better than his nearest neighbors was, that if scrubbed with lye soap in very hot water, his skin was white". This shows if Tom was white he would be just as good or better than Mr. Ewell and he would not be charged with this when there is no evidence.