Definitely a book that everyone should read...
I do understand what you are saying literarisch: why would Anne Frank be honored and all the other victims forgotten? But she has become a symbol. By leaving us this authentic testimony, not a book written later for readers but a day to day account of her experience which wasnt meant to be read by anybody, she gives us the opportunity to better understand how life was for the victims at that time: not just her, but all those who faced similar situations
Actually I read this book when I was a kid and loved it but I was even more fascinated by the autobiography of Miep Gies, one of the persons who risked their lives to help the Franks when they were hidden: she was the one who did their shopping for them and visited them every day, bringing food, news and a breath of fresh air from the outside. She was also the one who went back after they were arrested, found Anne's diary and kept it until her father came back and Anne was declared dead.
Her account, Anne Frank remembered, is really interesting and complimentary to the diary because it shows the same story under her point of view, as an adult and as someone from the outside. Also, it tells about Miep's life, which is incredible in itself: she grew up during WW1, in germany I think, and after that was sent, like many other german kids between the two wars, to live with a host family in the netherlands because her own was too poor to take care of her. She never returned home. She then lived through WW2, and Otto Frank's (Anne's father) desperate search for the rest of his family after the war had ended and he was the only one to return.
Unfortunately it isnt an easy book to find, as it is old and didnt have the success Anne's diary did. But you might find it second hand or in your local library. I am looking for it right now and will post a proper review once I get it.