One of the primary concerns of "Harry Potter and the Chamber of Secrets" is the destructive nature of prejudice. The novel highlights the dangers of making assumptions about others based on their blood status, as embodied by the character of Tom Riddle, aka Lord Voldemort. Riddle's past and his manipulation of the Chamber of Secrets serve as a cautionary tale about the perils of prejudice and the devastating consequences of allowing it to guide our actions.