I have the exact same opinion on this. But still I would not forbid myself any kind of music just because I cannot relate to the lyrics. Since music is a language of the mind, the music of a sick mind can be a very interesting thing, because above all it is a very authentic kind of music, since the artist is driven by strong emotional intuition in composing it. Authenticity alone gives music its expressive power, I think. I'm particulary looking for interpretation in that, which my brain finds very stimulating. Identification, on the other hand, does not necessarily take place in my personal music experience. I like my freedom to interpret things as I wish to do, especially the music.