I would never say that literature should have a goal... it's up to each author to determine what they want their work to accomplish. What I will say is that for me personally, I read (or listen to, these days) fiction to be entertained and for no other reason. If the book also makes me think, or gives me an emotional reaction, or expands my worldview, that's all gravy, as long as that stuff doesn't get in the way of the entertainment. As soon as the book stops being entertaining it becomes worthless for me. I read non-fiction when I'm in the mood to learn something sans the entertainment.