Hi, I need people who know alot of music!?

Kay so we're doing a project in english on the nature of mankind and how mankind is destructive and selfish and what not and basically cruel such as the holocaust and othe epidemics and I need a song that sort of relates to this and how your perception shapes your reality and how man has been cruel and what not all I need is the song or poem and then I have to annotate and evaluate and what not so please help if you can! much thanks!