The idea just came to me in a caffeine high. There are themes of MCs falling from grace etc and coming of age and all that common let's show the capacity for human beings to be good despite all the blah blah. I'm wondering if there are MCs who are regular people who end up becoming murderers or rapists or something to the point that readers become really uncomfortable and find it difficult to even empathize. Not even necessarily as a result of situation, but like actually a person just becomes curious and wants to do something evil and does it. I'm sure there are narratives like this although they're probably somewhat rare, and I can't think of anything off-hand. I'm sure in the genre of crime fiction there's a lot of this but I would hate for this embrace the shadow archetype theme to be relegated to only "the criminal mind" or something. Also important is the *MC* being like this, since there are always complicated side characters like this but they're almost never at center of the main narrative because I suspect people don't want to digest the concept that we all have equal capacity for evil (because they and we generally like to prop ourselves up on the idea that we all have equal capacity for good, or however that goes).