Books are invaluable tools for learning, yet throughout history, some have been written with misleading or false information. These books have, in many cases, contributed to widespread harm, including devastating wars and the rise of corrupt political regimes.
Here is a list of 10 of the most damaging books of this kind—those that have caused more harm than good. A common thread through these works is misleading information, often not intended, but with consequences that have been profoundly destructive.
I have deliberately excluded some of the more obvious books, as they are likely to be mentioned in the comments section. This list is presented in no particular order.
SEE ALSO: 10 Shocking Unnatural Disasters
10 Malleus Maleficarum Heinrich Kramer and Jacob Sprenger, 1486

Why it’s on the list: It played a significant role in sparking witch hunts throughout Europe
Malleus Maleficarum (“The Hammer of Witchcraft”) was a guide for witch hunters and judges on how to identify and eradicate witches. Released just before the Protestant Reformation, it became widely popular among reformers seeking to rid their nations of “evil.” Between 1487 and 1520, 20 editions were printed, with an additional 16 editions published from 1574 to 1669. This book was a key catalyst for centuries of witch hunts.
9 Coming of Age in Samoa Margaret Mead, 1928

Why it's on the list: It turned out to be a reflection of her own sexual confusions and desires
Margaret Mead, an American cultural anthropologist, traveled to Samoa in the 1920s to explore questions about sexuality, particularly regarding women in America. However, the young people she interviewed in Samoa fabricated wild stories about sexual promiscuity, which Mead accepted as truth. One girl later confessed: 'She must have taken it seriously, but I was only joking. As you know, Samoan girls are terrific liars when it comes to joking. But Margaret accepted our tall tales as though they were factual.' If Mead had questioned them, the girls would have revealed the truth, but Mead never doubted their accounts. According to Wikipedia: 'The use of cross-cultural comparison to highlight issues within Western society was highly influential, and contributed greatly to the heightened awareness of Anthropology and Ethnographic study in the USA.' Interestingly, Mead was a respected academic who also played a significant role in the creation of the 1979 American Book of Common Prayer (Church of England).
8 The Prince Niccolò Machiavelli, 1532

Why it's on the list: It became the blueprint for numerous tyrannical regimes (Stalin kept it by his bedside)
The Prince is a treatise aimed at rulers who are willing to abandon all ethical considerations, to the point where they might view evil as a more effective tool for the benefit of society than good. Machiavelli sought to spark a revolution in the hearts of his readers, and he certainly succeeded. He boldly expressed ideas that others before him had only dared to hint at, and voiced concepts that had never even been considered. As Machiavelli wrote: 'It is not necessary for a prince to possess all the aforementioned qualities [merciful, faithful, humane, honest, and religious], but it is crucial to appear to have them. In fact, I would go so far as to say that by embodying them and consistently upholding them, they are harmful; whereas by merely appearing to have them, they prove useful.' Some of the most notorious figures influenced by this book include Stalin, Hitler, Mussolini, and Napoleon I of France.
7 Mein Kampf Adolf Hitler, 1925

Why it's on the list: It played a major role in spreading Hitler's genocidal anti-Semitic ideology
In his book Mein Kampf, Hitler presented a dangerous ideology aimed at constructing a new Germany, one rooted in racial supremacy, including the systematic extermination of Jews. He also advocated for a war with France and Russia to create more space for Germans. When it was first published, the book went largely unnoticed, but its significance grew as Hitler gained power. By 1945, it was estimated that over 10 million copies were in circulation. The book's foundation was heavily influenced by The Crowd: A Study of the Popular Mind by Gustave Le Bon (1895), which highlighted the use of propaganda to manipulate mass behavior. Hitler also borrowed from the fabricated Protocols of the Elders of Zion, reinforcing his anti-Semitic agenda. He spoke of “The Jewish Peril,” a supposed conspiracy of Jews to dominate the world. The text outlines a racial worldview, dividing people into superior and inferior groups. In 2003, the sequel to Mein Kampf, Zweites Buch (“Second Book”), was published in English, offering further elaboration on Hitler's plans for world domination, including a war with the United States and the British Empire.
6 The Pivot of Civilization Margaret Sanger, 1922

On the list because: it advocates for eugenics
Margaret Sanger, recognized as the mother of modern contraception and the founder of Planned Parenthood, expressed her controversial views in her 1922 book, The Pivot of Civilization. She championed the notion of eugenics, the idea of controlling human reproduction to foster racial purity—a concept she shared with Hitler, who promoted similar ideas in Mein Kampf. Sanger’s endorsement of contraception was rooted in her belief that inferior humans should be eliminated to make room for a superior race. She didn't just entertain popular ideas of her time, but strongly advocated for them. In her book, she declared, “the most urgent problem of to-day is how to limit and discourage the over-fertility of the mentally and physically defective.” She even suggested that “possibly drastic and Spartan methods may be forced upon American society if it continues complacently to encourage the chance and chaotic breeding that has resulted from our stupid, cruel sentimentalism.” In Sanger’s view, birth control was “the greatest and most truly eugenic method.” Over time, Planned Parenthood has worked hard to distance itself from Sanger’s extreme views.
SEE ALSO: 10 Narrowly Averted Disasters That Nearly Shook The World
5 Democracy and Education John Dewey, 1916

On the list because: it persuaded the world that education should be focused on developing thinking abilities, not merely on memorizing facts
In Democracy and Education, John Dewey critiques the educational system that emphasizes traditional character development and the transmission of rigid knowledge, advocating instead for teaching critical thinking ‘skills.’ His ideas have had a profound impact on the trajectory of American education, particularly within public schools. This book can be seen as a manifesto against classical education. The result? A generation of students with an education that lacks a solid grounding in factual knowledge. Dewey, a co-founder of Pragmatism, a philosophical movement that posits that ‘truth’ is not absolute but can be shaped and evolve, would likely see the current curriculum in New Zealand as a success, as it largely mirrors his educational philosophies.
4 Baby and Childcare Benjamin Spock, 1946

Listed due to: the dangerous advice that led to fatalities
Despite differing views on Benjamin Spock's approach, it is undeniable that his advice to put babies to sleep on their stomachs likely contributed to numerous deaths, including instances of crib death. Spock's guidance, widely adopted by healthcare professionals until the 1990s, warned that babies sleeping on their backs could suffocate from their own vomit. Unfortunately, research later revealed that this recommendation caused more fatalities through suffocation. It’s estimated that up to 50,000 deaths occurred as a result. Furthermore, Spock promoted an approach to child-rearing that rejected discipline-based methods. Prior advice emphasized the importance of babies adhering to a regular sleep schedule and discouraged frequent holding, but Spock advocated for the opposite approach, reassuring parents that comfort and attention during crying would lead to better sleep patterns.
3. Darwin’s Black Box Michael Behe, 1996

Included because: it supports fundamentalist critiques of Science
This book challenges aspects of Charles Darwin's theories, providing ammunition for fundamentalists who assert that the Earth can only be explained through a literal interpretation of the Book of Genesis. Despite widespread discrediting by the scientific community, many fundamentalists continue to cite this work as 'proof' that evolution is false. It’s important to note that the book was not subject to peer review, contrary to Michael J. Behe's claims under oath. The scientific community has overwhelmingly rejected its premises. While Behe is not a fundamentalist and does not advocate for a literal biblical interpretation, his work is still used by others in this way.
SEE ALSO: Top 10 Classic Books That Are Unreadable
2 The Manifesto of the Communist Party Karl Marx and Friedrich Engels, 1848

Included because: it might be considered the most harmful book ever written
This book has been a source of inspiration for some of the most oppressive regimes in human history. Even though no state has fully embraced a Marxist system, its contents have driven actions so destructive that it cannot be ignored from a list like this. Among the ideas presented in the manifesto are the elimination of private land ownership, confiscation of the property of emigrants, implementation of steep taxes, and the abolition of inheritance rights.
1. The Protocols of the Elders of Zion Unknown

Listed because: it was a propaganda tool created to provoke racial animosity
The Protocols of the Elders of Zion is a pamphlet that falsely claims to reveal a conspiracy by Jews and Freemasons to dominate the world. Although the pamphlet is a fraud, it was widely distributed and believed to be true by many Europeans. Even today, some people still regard it as fact. It played a key role in fueling Hitler's anti-Semitic campaigns in Germany and was used after the Russian Revolution to incite hatred and violence against Jews. The booklet continues to be printed and circulated in several Middle Eastern countries, many of which are political adversaries of Israel.
