As has been stated before, I don't think an artist should be obligated to portray anything they do not feel. Artist that have shared events from their times have given us valuable insights into their time, culture and/or point of view, sometimes much deeper than mere facts could have. Sometimes this takes you to a negative, ugly place but it is still a valuable insight. The poem I remember most from my first poetry class was, the Death of a Ball Turret Gunner, by Randall Jarrell, it was dark yet moving and took you to his perspective.