In a famous essay published four decades ago, the Stanford sociologist Mark Granovetter set out to explain a paradox: “situations where outcomes do not seem intuitively consistent with the underlying individual preferences.” What explains a person or a group of people doing things that seem at odds with who they are or what they think is right? Granovetter took riots as one of his main examples, because a riot is a case of destructive violence that involves a great number of otherwise quite normal people who would not usually be disposed to violence.
Most previous explanations had focussed on explaining how someone’s beliefs might be altered in the moment. An early theory was that a crowd cast a kind of intoxicating spell over its participants. Then the argument shifted to the idea that rioters might be rational actors: maybe at the moment a riot was beginning people changed their beliefs. They saw what was at stake and recalculated their estimations of the costs and benefits of taking part.
But Granovetter thought it was a mistake to focus on the decision-making processes of each rioter in isolation. In his view, a riot was not a collection of individuals, each of whom arrived independently at the decision to break windows. A riot was a social process, in which people did things in reaction to and in combination with those around them. Social processes are driven by our thresholds—which he defined as the number of people who need to be doing some activity before we agree to join them. In the elegant theoretical model Granovetter proposed, riots were started by people with a threshold of zero—instigators willing to throw a rock through a window at the slightest provocation. Then comes the person who will throw a rock if someone else goes first. He has a threshold of one. Next in is the person with the threshold of two. His qualms are overcome when he sees the instigator and the instigator’s accomplice. Next to him is someone with a threshold of three, who would never break windows and loot stores unless there were three people right in front of him who were already doing that—and so on up to the hundredth person, a righteous upstanding citizen who nonetheless could set his beliefs aside and grab a camera from the broken window of the electronics store if everyone around him were grabbing cameras from the electronics store.
Granovetter was most taken by the situations in which people did things for social reasons that went against everything they believed as individuals. “Most did not think it ‘right’ to commit illegal acts or even particularly want to do so,” he wrote, about the findings of a study of delinquent boys. “But group interaction was such that none could admit this without loss of status; in our terms, their threshold for stealing cars is low because daring masculine acts bring status, and reluctance to join, once others have, carries the high cost of being labeled a sissy.” You can’t just look at an individual’s norms and motives. You need to look at the group.
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