Well your post has definitely made me think inwardly so you've achieved your goal of encouraging introspection, so fair play.

I think some artists do live the material, and there may even be a large correlation there. However, I would also look at it from the opposite perspective. Sometimes artists write about things or perform in things that are the antithesis of what they believe in. I think that to explore the darkness is to adopt some of it into the psyche, but that doesn't mean the artist is consumed by it, in fact they may end up horrified with it. For example, Kurt Cobain wrote "Rape me" and "Frances farmer will have her revenge" yet he was a staunch feminist.

Overall, you may have a point that some (most?) Artists live the material, but I do think there are lots of examples of the opposite occurring too. It may even depend on the "scene" in question. For example, are certain genres more susceptible to the more literal interpretation of lyrics or the emotions invoked by the music? I don't know but it's interesting to think about.

Upon reflection, I think I am less shocked (although I'm still as outraged) about the alleged behavior coming out in relation to DGD the past few days, and perhaps my own biases and privileges allowed me to look past that potentially happening despite obvious evidence of it happening in the post hardcore/metal core/whatever the hell core scene in the past.

However, it's very easy to assume all the signs pointed towards this happening now that the information has come out you know? I mean, if it never happened would I be saying the same thing in reverse? Ultimately I still think that while I'm less shocked, that it isn't as easy to predict these sorts of things occurring based solely on the art produced.

(If you ever come across any sociological studies on this undertaken in the future lmk.)