That's the stuff!

Why is it that everyone want's to write about love and hate? Like that's those are the only things that exist in the world.... Why is it so taboo to write a great song about the economy, or global warming? Why is it that modern pop artists feel that they have to leave those topics to artists like Bono, or Lupe, or Talib, or John Mayer???? When did America become so shallow?