I came to the conclusion that good and evil are not objectively real, or even useful concepts
...
I often agree that things labeled evil do more harm than good
Do more what than what?
I haven't gotten around to deconstructing those terms yet, but off the top of my head:
A 'harmful to X' action is one that has a long-term effect on it that reduces its ability to function. Examples:
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: