Good vs. Evil

I don't think that people are good or evil. I think that some people try to do good things some dont but       poeple are neither good nor evil. The lady who gave the wallet back isn't better than anyone else she just did a good thing. Neither can defeat the other because their are no absolute goods or evils. I don't think it is even necessary for them to exist because who can judge if we all  "bad" things then how can we say we are "good" or have the right to say someone else is not good? I think that interns of examples one of the best is Gatsby of The Great Gatsby in terms of who is good or evil and how they don't necessarily exist. He is presented throughout the entire book as good at least through the narrator's eyes but many of us see Gasby as bad or evil. If he were actually are real things they are at least fluid ideas not concrete definitions. When we don't agree on if a single character is good, how can we rule if a person, who has a entire life not just what a book tells us of a character's life, is good or evil?