Hope, Despair and Memory: Questions

Is it solely on the shoulders of the survivors of tragedies to speak about their experiences, or is it the responsibility of those who weren't persecuted to speak out on their behalf?
How responsible is the development of Western civilization for the Holocaust?
How can our present be shaped by how we remember our past?
How can memory spark hope in the light of countless past atrocities?
Why can narrative be seen as more important than other kinds of art—music, painting, and sculpture—in conveying the experience of having survived an atrocity?