"A few police officers in Hong Kong rang Kowloon's bell, the door opened and gangsters shot with AK-47 and other automatic weapons ..." people commented. (Murphy 1) Since the beginning of civilization human beings have committed crime, and crime has increased as cities evolved. But the problem is that the poor urban population and the crime rate in developing countries has increased exponentially.
The overall crime rate in 2016 is expected to increase by 3%, the same as in 2015. The crime rate is expected to decrease in 12 cities. These declines were offset by Chicago (up 1%) and Charlotte (17.5%). Nationally, the crime rate is still historically at a low level. Nationwide, the murder rate is expected to increase by 31.5% from 2014 to 2016 - half of the murder is thought to be due to Baltimore, Chicago, Houston (12). For example, in San Jose, the murder rate of 66.7% of the city rose with only 21 new homicides. Based on these data, the authors concluded that there is no evidence of nationwide homicide waves, but the increase in these chosen cities is certainly a serious problem (13). We know that more police can significantly reduce crime (14)
In the past two decades, the prison system continued to evolve and the crime rate rose sharply. Since last year, the violent crime rate has increased by 15% and the property crime rate has risen by 12%. Police are now present in almost every place in the country, all schools, all workplaces, and all communities, but the crime rate is still increasing. "The militarization of the police" in the United States has hardly helped to reduce the crime rate and it is becoming an important part of today's American life (Madar). As a social problem, crime represents a departure from social norms and is the result of education, unemployment, and lack of legal system.
Changes in the crime rate are not related to the imprisonment rate. In the early 1960s, the crime rate began to rise about 10 years before the imprisonment rate. In the 1980s, the crime rate of violence and property changed and the prison rate continued to rise. By the end of the 1990s, the crime rate fell to the level of the 1970s and continued to decline through the 2000s; however, the incarceration rate continued to increase in 2000 and peaked in 2007 (see chart). The arrest of each crime is relatively stable. Even if the crime rate remains stable, if the police are more effective in criminal arrests, the imprisonment rate may also rise. However, "By measuring the rate of arrest for crime, police efficiency has not increased from 1980 to 2010, which may explain the higher prison rate," the National Research Council Recent report concluded.