Is it okay to read someone else's diary?

Anne Frank was a young Jewish girl who was killed by the Nazi's a long time ago. Before she died she wrote a diary which ended up become a book. It has now been read by millions of people and is often given to school kids to read in English class. But should we really be reading her diary at all? Interview: Stephanie Irvine Brains Trust: Newtown Public School: Kate, Wolfgang, Gabriel, Jesse, Betty, Honey.