What is the theory of criminal heredity?
The theory of criminal heredity held that the tendency to crime is passed down biologically from parents to children. Studies such as Richard Dugdale's on the Jukes family (1877) and Henry Goddard's on the Kallikaks (1912) seemed to prove it, but they confused heredity with poverty and environment, and they laid the ground for eugenics.
"Like father, like son." "It's in the blood." The intuition that criminality is inherited, that some families and "bad seeds" are destined for crime by their bloodline, is ancient. The theory of criminal heredity tries to turn it into science: the tendency toward crime would be transmitted biologically from parents to children. It is one of the most influential and dangerous theses in criminology, because it starts from a partial truth (children do resemble their parents) to leap to a false conclusion: that this resemblance proves that crime travels in the genes.
Criminal heredity at a glance
- Authors
- Richard Dugdale · Henry Goddard
- Era
- Crystallizes in the 19th c.
- Family
- Biological
- Idea
- The tendency toward crime is transmitted biologically from parents to children
Family resemblance in crime → attributed to the genes (confusing heredity with environment)// OriginThe Jukes, the Kallikaks and the dream of bad blood
The theory crystallized in the 19th century with the studies of criminal families. In 1877, Richard Dugdale published The Jukes, a tracing of an American family across generations abounding in criminals, beggars and "degenerates." Dugdale gave great weight to the environment and called for social reforms, but the book was soon reread as proof that degeneration was inherited, a reading that Arthur Estabrook reinforced in The Jukes in 1915 (1916). In 1912, Henry Goddard did the same with the "Kallikak" family. These studies became the "scientific" basis of the eugenics movement, which proposed sterilizing the "genetically inferior" to prevent them from transmitting their supposed criminality. Thousands of people were forcibly sterilized in the United States and Europe on that logic.
Modern science refined the question with twin and adoption studies, which compare identical and fraternal twins, or children adopted by their biological and adoptive parents, to separate the genetic from the environmental. Its answer was not the one the eugenicists dreamed of, and the family studies were demolished: they conflated poverty with genetics and did not distinguish heredity from shared environment. In the case of the Kallikaks, Stephen Jay Gould also charged that some photographs had been retouched to make the family look more "degenerate" (an accusation that is itself debated).
The problem of criminal heredity
Children resemble their parents. But they inherit their house, neighborhood, poverty and lessons as much as their genes.
The resemblance that deceives
The heart of the problem is that family resemblance has many causes, and genetics is only one. When the child of a criminal is also a criminal, biological heredity is the least proven explanation: that child also inherited the poor neighborhood, the school that failed, the lack of opportunities, the direct learning of their parents' behavior, the stigma of the surname, the trauma. "Criminal dynasties" prove that disadvantage is transmitted, through a thousand social channels. The naive version of the theory confuses correlation (criminals tend to have criminal children) with genetic heredity. Separating those layers is the whole challenge.
The resemblance that deceives, step by step
- 1Real observationThe children of criminals do tend to offend more than average
- 2Naive leapThat resemblance is attributed to genetically inherited "bad blood"
- 3The underlying errorCorrelation is confused with heredity: the child also inherits neighborhood, poverty, learning and stigma
- 4What science actually showsTwin and adoption studies: moderate heritability of temperamental traits, not of "crime," and expressed only according to the environment
"Criminal dynasties" do not prove that crime is inherited: they prove that social disadvantage is transmitted through a thousand channels.
// In fictionDynasties of the blood
Illumi, from Hunter × Hunter, belongs to the Zoldycks, a family of professional assassins who have raised their children to kill for generations. He is the perfect case for dismantling the theory, because his "gift" for crime comes from brutal training from the cradle, not from the genes. Baron Harkonnen, in Dune, embodies the aristocratic "house" whose depravity is presented as a trait of blood, transmitted from generation to generation like the title: the image the theory had of itself. Tywin, the Lannister patriarch of Game of Thrones, lives obsessed with the family legacy and molds his children, with monstrous results, to embody that inheritance, which makes him a case of social rather than biological transmission.
Bellatrix, in Harry Potter, is the fanatic of "blood purity" taken to a homicidal extreme: she literally believes that blood determines a person's worth, the ideology of heredity turned into magical supremacism. Diosa de la Muerte, in Thor, fits less well: she is the firstborn whose conquering violence Asgard concealed and denied, and her story speaks more of a hidden imperial past than of a crime passed down through the blood.
From the caste of assassins to the hidden heir: dynasties where blood seems destiny. Tap to open their case file.
// What we do knowHeritability is not destiny
Well-conducted twin and adoption studies show that certain temperamental traits associated with antisocial behavior have a moderate heritability: "stealing" or "killing" is not inherited, but in part impulsivity, low emotional reactivity or sensation-seeking are, and in certain environments they raise the risk. Heritability means far less than it sounds: it measures how much of the variation of a trait in a population is associated with genetic variation, not whether your destiny is written in your genes. And that predisposition is expressed only in interaction with the environment, as the biosocial model and the MAOA gene show: the same genes produce a delinquent or a surgeon depending on the life that surrounds them.
// The flawThe most dangerous alibi in criminology
The theory of criminal heredity is the one that has caused the most direct harm in the entire discipline, and its flaw is historical: it served as the foundation of eugenics. If crime is inherited, they reasoned, "born criminals" must be prevented from reproducing, and from there to the forced sterilization of tens of thousands of people, racial purity laws and, at its extreme, the Nazi extermination, there is a straight line. Any claim about the "heredity" of crime carries that shadow. The second flaw is the individual alibi: "it's in my blood, I couldn't help it." Neither the heritability of a temperament nor a surname forces anyone to offend: Illumi was trained to kill, and many children of criminals break the chain. Blood is neither destiny nor excuse.
From the Jukes to forced sterilization
The 19th-century "criminal family" studies became the "scientific" basis of the eugenics movement, with direct consequences in laws and courts. Only modern genetics, with twins and adoptions, reformulated the question honestly, and found heritability of traits, not of destinies.
- 1877Dugdale publishes The Jukes: he stresses the environment, but the eugenicists will read it as proof of heredity.
- 1912Goddard publishes the study of the "Kallikak" family, with the same hereditary thesis.
- 1927The U.S. Supreme Court upholds forced sterilization (Buck v. Bell).
- 1984Mednick and others use adoption studies to finally separate the genetic from the environmental.
Lights and shadows
- It contains a grain of truth: behavioral genetics finds a moderate heritability of temperamental traits associated with antisocial behavior.
- It spurred rigorous methods (twin and adoption studies) that today allow the genetic to be separated from the environmental.
- It pointed out, clumsily, that biology matters: it prepared the ground for the biosocial model and gene-environment interaction.
- Its demolition taught how to distinguish correlation from heredity, a central methodological lesson.
- It confuses family resemblance with genetic heredity, ignoring the neighborhood, poverty, learning and stigma that are transmitted.
- Its founding family studies (the Jukes, the Kallikaks) conflated poverty with genetics and did not separate heredity from environment.
- It founded eugenics: it was the alibi for tens of thousands of forced sterilizations.
- It is used as a deterministic alibi ("it's in my blood") that neither heritability nor a surname justifies.
// Why it mattersBreak the chain, don't blame the blood
Rightly understood, the theory of criminal heredity teaches the opposite of what the eugenicists dreamed: since the transmission of crime is above all social (poverty, learning, trauma, stigma passing from parents to children), the chain can be broken by intervening in the environment, not in the genes. Programs that take a child out of a criminogenic setting and give them the school, the support and the opportunities their family could not achieve what no sterilization ever could: that the delinquent's child not become one. The "criminal dynasty" is perpetuated as a social disadvantage, and for that very reason it can be interrupted.
Three key takeaways
- Criminal heredity: the idea that crime is transmitted biologically from parents to children. It crystallized with studies of "criminal families" (Dugdale's Jukes, reread by the eugenicists), later demolished for confusing poverty with genetics, and founded eugenics.
- The underlying error: confusing family resemblance with genetic heredity. Serious science (twins and adoption) finds a moderate heritability of temperamental traits, not of "crime," and expressed only according to the environment.
- It is the theory that caused the most direct harm (forced sterilizations, eugenics, extermination). Rightly understood, it teaches the opposite of fatalism: the chain is broken by intervening in the environment, not in the blood.
Sources · further reading
- Dugdale, R. L. (1877). The Jukes: A Study in Crime, Pauperism, Disease and Heredity. Putnam.
- Gould, S. J. (1981). The Mismeasure of Man. Norton.
- Mednick, S. A., Gabrielli, W. F. & Hutchings, B. (1984). “Genetic Influences in Criminal Convictions”. Science, 224.
- Rafter, N. (1997). Creating Born Criminals. University of Illinois Press.
// Test the theoryWhich of these villains does KRIMINIS analyse with Theory of Criminal Heredity?
Theory questionsFrequently asked questions
What is the theory of criminal heredity?
The theory of criminal heredity held that the tendency to crime is passed down biologically from parents to children. Studies such as Richard Dugdale's on the Jukes family (1877) and Henry Goddard's on the Kallikaks (1912) seemed to prove it, but they confused heredity with poverty and environment, and they laid the ground for eugenics.
Who formulated the theory of criminal heredity, and when?
It took shape in the 19th century through studies of criminal families. Richard Dugdale published "The Jukes: A Study in Crime, Pauperism, Disease and Heredity" in 1877, although he gave great weight to environment and called for social reform; it was his readers who turned it into proof of heredity. Henry Goddard repeated the hereditarian thesis in 1912 with his study of the "Kallikak" family.
Is the theory of criminal heredity still accepted?
Its naive version is refuted; behavioural genetics has qualified it by finding moderate heritability of temperament traits linked to antisocial behaviour. Mednick's adoption studies (1984) finally allowed genetic and environmental influences to be separated. Its great flaw is historical: it was the foundation of eugenics and of the forced sterilisation upheld in 1927 by the United States Supreme Court.
Which villain in the archive helps dismantle criminal heredity?
Illumi, from "Hunter × Hunter", a member of the Zoldycks, a family of professional assassins who have raised their children to kill for centuries. He looks like perfect proof of the theory and in fact refutes it: his "gift" for crime comes not from genes but from brutal training from the cradle. What passes from parents to children there is an upbringing.