Mockingbirds within the novel, are primarily symbols of innocence. It also symbolizes goodness and beauty. When Miss Maudie first explains to Scout the meaning of Atticus' statement -- that it's a sin to kill a mockingbird -- she agrees with him.
Jem and Scout particularly symbolize innocence, goodness and beauty too. Although they are a bit more rambunctious than some children, their childlike questions and responses to the good and bad around them and their innate willingness to foster goodness in their actions make them positive symbols for the future of Maycomb.
He’s trying to express that the world is full of evil and wickedness
Graffiti should be legal because it can used for educational purposes. For example, doing graffiti in a art class. Also, it represents art, which is a big factor in human society. Graffiti shouldnt be legal because some people may jeoperdize other people's property. For example, spray painting on the back wall of a house that isnt permitted. Also with all the symbols that can be made, groups could be formed based on marking territory with graffiti art.
The 5 differences in the image above are the buildings, the little girl, a fish, a kite, and a 3rd bird.
Same Sex Marriage. One state has it, federal law prohibits it. Many states also prohibit it and prohibit recognizing such a marriage from another state. (In essence violating the full faith and credit clause of the constitution, but there are lots of examples that in law) The US supreme court has not weighed in. So the issue is open. This issue could go lots of ways, depending on what cases get to the supreme court.