6) Why are there so many books, movies, documentaries, etc. about the Holocaust? Why do we keep retelling this story?

there many books, movies, documentaries, etc. about the Holocaust because to tell people that during the holocaust there were many peope in Jewish punished by German and lived very sadly everyday. I think we keep retelling this story because to make people don't forget about how the Jewish people were lived and how they were treated by German during the Holocaust.