Tyler Cowen argues in a TED talk (~15 min) that stories pervade our mental lives. He thinks they are a major source of cognitive biases and, on the margin, we should be more suspicious of them - especially simple stories. Here's an interesting quote about the meta-level:
What story do you take away from Tyler Cowen? ...Another possibility is you might tell a story of rebirth. You might say, "I used to think too much in terms of stories, but then I heard Tyler Cowen, and now I think less in terms of stories". ...You could also tell a story of deep tragedy. "This guy Tyler Cowen came and he told us not to think in terms of stories, but all he could do was tell us stories about how other people think too much in terms of stories."
Rough definitions: good for agent X - net positive utility for agent X, evil for agent X - net negative utility for agent X. Or possibly: evil for agent X - a utility function that conflicts with that of agent X.
Good and evil don't have to be "written into the structure of the universe" to be coherent concepts. I assume you make choices. What is your criterion for choice? I also assume that you aren't completely selfish. You care about the welfare of other people at least to some degree right?
Of course, if two people/agents truly have differing utility functions, what is good to one may be evil to the other, but that doesn't invalidate the concepts of good and evil.
That's not 'good and evil', just 'desired and undesired' - much milder and broader concepts.