He (Bob Marley) had this idea, it was kind of a virologist idea, he believed he could cure racism and hate, literally cure it by injecting music and love into people's lives. One day he was scheduled to perform at a peace concert, gunmen came to his house and shot him down. Two days later he walked out on that stage and sang. Somebody asked him why. He said the people who were trying to make this world worse are not taking a day off. How can I? Light up the darkness.
-Bob Marley, Movie I Am Legend story told by character Robert Neville M.D., played by Will Smith