La Part d'ange en nous

In the decade following World War II, homicide rates in many Western nations were nearly double what they are today. A citizen of London in 1957 faced a greater risk of being murdered than a citizen of that same city in 2017. Even more striking is the long view: archaeological evidence from prehistoric sites suggests that for every 100,000 individuals, between 300 and 500 died by human hands each year. Today, in even the most turbulent regions, that number is a small fraction of what it once was. Across centuries and millennia, the statistical portrait of humanity reveals a dramatic, if uneven, decline in nearly every form of violence, from battlefield deaths and genocide to domestic abuse and schoolyard bullying.

This overwhelming trend presents a profound paradox. If our daily news feeds are filled with reports of conflict, crime, and cruelty, how can the data paint such a radically different picture of human history? This very question is what drove Steven Pinker, a Johnstone Family Professor of Psychology at Harvard University, to embark on a monumental research project. As a cognitive scientist who had spent his career studying language and the mind, Pinker was accustomed to dissecting complex systems. He turned this analytical lens toward the historical record, compiling and synthesizing thousands of data points from hundreds of sources to investigate whether the perception of a violent world aligned with the reality of our past. The result was a comprehensive account of the forces that have, against all odds, allowed our better angels to prevail.

Module 1: The Great Decline — A Counterintuitive History of Violence

Most people get history wrong. We tend to believe the past was simpler and the present is uniquely violent. Pinker’s central argument is a direct challenge to this intuition. He presents a radical idea backed by centuries of data. Violence has been in a long, steep, and undeniable decline.

This is a seismic shift in the human condition. Consider homicide rates in Europe. In the 14th century, you might expect around 100 homicides per 100,000 people each year. By the 17th century, that number dropped to 10. Today, it’s closer to 1. That’s a hundredfold decrease. This isn’t just about ancient history. Even in recent decades, the trend continues. In the United States, reported rape fell by 85% between 1979 and 2006. Physical and sexual child abuse cases were cut in half over just twenty years.

So why do we feel like the world is getting worse? Pinker points to a cognitive bug. Our perception of violence is distorted by media and psychological biases. The human brain uses a shortcut called the availability heuristic. We judge the frequency of an event by how easily we can recall examples. News media, operating on the principle "if it bleeds, it leads," constantly feeds us vivid images of the worst violence from around the globe. This creates a false impression of prevalence. One survey showed that people in England believed the 20th century was more violent than the 14th. The reality is the exact opposite.

This decline is a multi-layered process. The book details several key historical waves of pacification. First came the Pacification Process. This was the transition from the anarchy of hunter-gatherer life to the first agricultural states. Archaeological evidence from skeletons like Ötzi the Iceman reveals that prehistoric life was brutal. Violent death rates in non-state societies were astronomically high, sometimes reaching 15% of all deaths. The creation of the first states, what Hobbes called the "Leviathan," established a monopoly on force. This new order drastically reduced the chronic raiding and feuding that defined tribal life.

Next up, Pinker introduces the Civilizing Process. Starting in the late Middle Ages, European societies underwent a profound psychological shift. Centralized states and commerce transformed a culture of honor into a culture of dignity. Feudal warlords were turned into courtiers. Impulsive violence and public cruelty were replaced by self-control, manners, and empathy. This was about internalizing restraint. Etiquette books from the era show a new focus on controlling bodily functions, using forks instead of knives at the table, and being sensitive to the feelings of others. These small changes in manners were symptoms of a larger change in mindset that made violence less acceptable.

Finally, we see the Humanitarian Revolution of the 18th century. Fueled by the Enlightenment, this movement saw the systematic dismantling of institutionalized cruelty. Reason and literacy expanded the circle of empathy, leading to the abolition of slavery, torture, and witch hunts. Thinkers like Cesare Beccaria argued for humane and proportional punishment. The rise of the novel allowed people to step into the shoes of others, fostering a new kind of compassion. These historical forces were driven by changes in how people thought and felt about each other.

Module 2: The Inner Demons and Better Angels — The Psychology of Violence and Peace

So, what is it about human nature that allows for both horrific violence and this remarkable decline? Pinker argues that our minds are not blank slates. We are not born purely good or evil. Instead, we come equipped with a set of competing psychological systems. He calls them our "inner demons" and our "better angels."

Let's start with the demons. Pinker identifies five key psychological roots of violence.
First is predatory or instrumental violence. This is cold, calculated violence used as a means to an end. Think of a robbery or a planned assassination. The perpetrator feels little emotion; the victim is just an obstacle.
Second is dominance. This is the drive for status, prestige, and power. It fuels competition and is a primary driver of violence between young men, from bar fights over trivial insults to wars fought for national glory.
The third demon is revenge. This is the burning desire to retaliate for a perceived wrong. It’s a powerful, universal impulse that can lock individuals and groups into devastating cycles of violence.
Fourth, we have sadism. This is the rarest but most chilling motive: deriving pleasure from another's suffering. While pure sadism is uncommon, it emerges in contexts like torture and serial killing.
Finally, and perhaps most destructively, is ideology. This is a shared belief system that justifies unlimited violence for a supposedly utopian good. Ideologies like Nazism or radical Communism have been responsible for the worst atrocities in history. They allow perpetrators to override their own conscience by framing their actions as necessary for a "greater good."

But flip the coin. We also have our better angels, the innate faculties that pull us toward peace.
First is empathy, especially in the form of sympathetic concern. This is the ability to feel for another person, to align our well-being with theirs. While empathy can be biased toward our in-group, it's a powerful force for altruism.
Second is self-control. This is the faculty that allows us to inhibit our impulses and think about long-term consequences. The Civilizing Process was, in essence, a massive, centuries-long project in strengthening societal self-control.
Third is our moral sense. This is a suite of intuitions about fairness, reciprocity, and justice. While morality can be co-opted by ideology to justify violence—think of honor killings or holy wars—it also underpins our concepts of rights and our condemnation of cheating and harm.
The final, and Pinker argues most important, better angel is reason. Reason allows us to step back from our immediate impulses and parochial loyalties. It enables us to understand the futility of cycles of violence, to design institutions that foster cooperation, and to expand our moral consideration to all of humanity.

Here's the key takeaway. The decline of violence resulted from changing historical incentives. These new circumstances systematically engaged our better angels and disengaged our inner demons. The rise of stable governments, the growth of commerce, and the spread of knowledge have created environments where empathy, self-control, and reason are more likely to triumph.