I think Ron Olesko and Richie have the right take on this. Some of the music is damn thought-provoking. Not all of it is centered on violence. Most of it, as someone mentioned, is about the human condition, from personal to all-inclusive. The presentation grates on me, and my ears take a beating, but I remember when my kids were playing Jefferson Airplane, The Beatles, Jimi Hendrix, etc. on the basement set-up. Now I realize that some of those people were damn good, inventive musicians.
I have caught up to their messages. I still prefer older folk, blues and classical music ("my kind"). I can't shed my spots but maybe I can add some different sizes and shapes to them.