Graffiti study bolsters 'broken windows' theory
Dutch researchers find that in the presence of graffiti and litter, people are more likely to commit small crimes.
In a series of real-world experiments, people exposed to graffiti, litter and other cues of lawlessness were more likely to commit small crimes, according to a study published today that bolsters the controversial "broken windows" theory of policing.
The idea is that low-level offenses like vandalism and panhandling create an environment that breeds bigger crimes. According to the theory, cops can help head off serious violence by keeping minor infractions in check.
Dutch researchers tested the psychological underpinnings of the theory and found that signs of social disorder damped people's impulse to act for the good of the community, allowing selfish and greedy instincts to take over. The results appear in the journal Science.
Community policing strategies based on the "broken windows" theory have taken root in cities across the U.S. and around the world since it was proposed in 1982.
Most famously, New York City saw a 50% reduction in crime in the 1990s after then-Mayor Rudolph W. Giuliani and then-Police Commissioner William J. Bratton -- now head of the Los Angeles Police Department -- cracked down on squeegee-wielding panhandlers and the like. They credited the "broken windows" approach for their success.
An array of social scientists examined the city's crime statistics, and many of them concluded that factors like the booming economy and decline of crack cocaine were actually responsible for the dramatic improvement.
Kees Keizer, a graduate student in the department of behavioral and social sciences at the University of Groningen in the Netherlands, thought psychology and sociology could add to the debate.
Human behavior is influenced by three competing instincts: to act in a socially appropriate manner, to do what feels good in the moment and to maximize one's resources. Keizer predicted that when there's less motivation to be socially appropriate, the other two impulses would take over.
To test this, he attached fliers for a fake sportswear store to the handlebars of bicycles parked in a shopping area. With no trash can nearby, shoppers returning to their bikes could either take the fliers with them or litter.
A wall near the bicycles had a sign indicating that graffiti was forbidden. When the wall was indeed graffiti-free, 33% of people left the fliers on the ground or attached them to other bikes. After Keizer painted graffiti on the wall, the percentage of people who littered rose to 69%.
