The Diary of a Young Girl by Anne Frank
Why do Mr. Dussel and Mrs. Van Daan seem to be the least sympathetic people in the Annexe?
Mr. Dussel and Mrs. Van Daan are Nazis.
Mr. Dussel and Mrs. Van Daan steal from the others in the Annexe, and Anne finds out.
Mr. Dussel and Mrs. Van Daan draw unwanted attention to the Annexe, which makes everyone dislike them.
Mr. Dussel and Mrs. Van Daan are frequently in conflict with Anne, from whose point of view the diary is written.