What purpose do colours serve for the narrator? Why does the narrator need distractions?

Check this out for colours:

http://www.gradesaver.com/the-book-thief/q-and-a/what-theeory-does-the-narrator-suggest-about-colors-70367/

Death grows weary of his job. The war kills so many people that Death needs distractions as to not become immune to all the suffering and repetition of his job.