First of all, a mockingbird is a symbol of something that brings nothing but pleasure and joy into our society and does us no harm. They are not necessarily harmed by society. It is a sin to harm a mockingbird because they cause no harm to us and bring us only joy.
Connecting: You might want to add some examples in this paragraph. How are the pure of heart harmed by society? How do they add pleasure to the world. Can you give me an example? Your statement is very general, so it lacks punch. If you want to be convincing, you have to add something more concrete that people can visualize. Perhaps a minister who does nothing but good for the society but is hampered by prejudice --- someone who doesn't like a black church or a Jewish synagogue and vandalizes the church or puts editorials in the newspaper. If you could find an actual example, it would be really powerful.
Connect to the text: Again, you need to add specific examples. You say that the author "tries to show characters that resemble the mockingbirds". Which characters? Who specifically? You might want to look at Miss Maudie, or use the ultimate example with Tom Robinson. He did nothing but good for Maybelle, and yet she sent him to prison. Find examples of the good he did for Maybelle: cutting her wood, helping her in the yard etc..
I have gone through and corrected your capitalization and spelling. Please be careful with this. It does interrupt the reading. A study was done of teachers, and it was found that the harder the paper is to read, the lower the grade. The teachers didn't do it on purpose, it was just a result of difficult reading. Good luck.