The Question and Answer section for East of Eden is a great resource to ask questions, find answers, and discuss the novel.
I'm sorry, this question is far too complex for a short-answer forum. Note, Gradesaver has an entire section on good and evil in the theme section of the study guide. You can link the study guide at the top of the page.
Your questions are really involved for this short-answer forum. Check out the GradeSaver themes page, especially Good vs Evil.