"Eventually, they may even break into the building"
Starting 1985, and more intently after the election of Mr Rudy Giuliani as Mayer of New York, the hypothesis behind Broken window theory was implemented in an effort to reduce crime rate in the city. Most known elements of this initiative were "quality of life" and "zero tolerance".
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"The broken windows theory is a criminological theory of the norm-setting and signaling effect of urban disorder and vandalism on additional crime and anti-social behavior. The theory states that maintaining and monitoring urban environments to prevent small crimes such as vandalism, public drinking and toll-jumping helps to create an atmosphere of order and lawfulness, thereby preventing more serious crimes from happening." Source: Wikipedia. Emphasis added.