“Crime in the world is primarily caused by weak law enforcement by governments.”

Levitt (2004) estimates that increases in the number of law enforcement officers between 1991 and 2001 resulted in a 5–6 percent reduction in crime rates nationally. More recently, Di Tella and Schargrodsky (2004) and Klick and Tabarrok (2005) demonstrated that increased police presence due to terrorist threats reduced crime in surrounding areas.

Overall, this survey suggests that it is far more important how police are used than how many there are. Increased police strength alone does not make a difference. Rather, many other factors must be considered if police presence is going to impact on crime rates.

The best available evidence points to other causes—among them, the massive social and economic dislocation resulting from the Covid-19 pandemic and the nationwide proliferation of guns along with the spread of racial and ethnic hatred and the violence it has roused. Analyses of bail reform show no clear link between bail reform and spikes in crime. Of twelve Democratic-led cities cited by Republicans as examples of where crime purportedly rose due to police defunding, criminal justice scholars find no discernible link between defunding and crime.

The National Institute of Justice catalogs research on multiple pathways to crime and desistance from crime among juveniles and adults, recognizing that crime causation involves complex interactions among individual, social, economic, and environmental factors rather than a single determinant.

A number of countries, predominantly in the Americas, show high and increasing rates. Such increases may be linked to the challenges of organized crime, drug trafficking, and gang activity.

Using a new panel data set on crime in medium to large U.S. cities over 1960-2010, we show that each additional police officer per 100,000 residents is associated with approximately 12 fewer violent crimes and 22 fewer property crimes per 100,000 residents. Every dollar spent on police is associated with approximately $1.60 in reduced victimization costs, suggesting that U.S. cities employ too few police.

After controlling for most of these issues, the economics literature supports the view that a larger police force generally reduces the index level of crime. The effect seems to be larger for violent crime (especially murder) than for property crime.

Police‐initiated pedestrian stop interventions were associated with a statistically significant 13% reduction in crime for treatment areas relative to control areas. These interventions also led to a diffusion of crime control benefits, with a statistically significant 7% reduction in crime for treatment displacement areas relative to control areas.

U.S. crime rates for the three violent crimes (homicide, rape, robbery) were several times higher than the averages for reporting European countries. The U.S. homicide rate was 10.5-7.9 per 100,000 population compared to Europe's less than 2 per 100,000. Data are based on crimes reported by law enforcement authorities to the United Nations, the International Police Organization, and the World Health Organization.

The report finds that increased incarceration has been declining in its effectiveness as a crime control tactic for more than 30 years. Its effect on crime rates since 1990 has been limited, and has been non-existent since 2000. More important were various social, economic, and environmental factors, such as growth in income and an aging population.

With targeted interventions backed by sustained engagement and trust between communities and law enforcement, bringing down homicide rates is possible. High levels of violence can also drive property values down and undermine business growth, thus exacerbating poverty, which can in turn lead to further violence.

Problem-oriented policing applies both elements combining the use of diverse approaches with focused action. There is a large body of evaluation evidence here applying weak-to-strong research methods that consistently finds that this combination does reduce crime and disorder. Focused problem-solving is even more effective than focused law enforcement.

Fifty-three percent say poverty and unemployment are the most significant causes of crime and violence. Following that, drug and alcohol abuse are seen as a root cause of crime by 43% globally. A majority (57% on average globally) say they trust law enforcement to treat all citizens with the same respect.

Americans as a whole favor addressing the root causes of crime over boosting law enforcement, and they oppose using military force in U.S. cities.

There is no one 'cause' of crime. Crime is a highly complex phenomenon that changes across cultures and across time. Crime occurs when there is a gap between the cultural goals of a society (e.g. material wealth, status) and the structural means to achieve these (e.g. education, employment). This strain between means and goals results in frustration and resentment, and encourages some people to use illegitimate or criminal means.

Two-thirds of the public think crime in the United States is a major problem and even more, 81%, think it's a major concern in cities.

Sociologists, backed by statisticians, have found causal relations between nearly every kind of social condition and crime. Poverty, insanitary housing, overcrowding, ignorance, idleness, density of population, unemployment—these and a host of others have been set down as causes of crime. The role of the economic factor as a causative element in crime has not been adequately explained by any method thus far used. Political factors including the link between politics and crime and the acceptance of protection money by the police contribute directly to crime.

The Rule of Law Index measures government accountability, absence of corruption, open government, fundamental rights, order and security, regulatory enforcement, and civil justice. Countries with higher scores in criminal justice and order/security tend to have lower crime rates, but economic factors and social conditions are also strongly correlated.

China's resilience score has marginally increased by 0.21 points, enough however to move it into the high resilience band. The modest improvement came in light of China's adoption of the country's first Anti-Organized Crime Law and an advance in countering money laundering, among others.

The report analyzes false narratives spread about the 2020 nationwide increase in homicides, including claims attributing crime increases to bail reform and attempts to defund police, finding these narratives lack empirical support.

The results showed weak correlations between police presence and jail ratio, arrest ratio, and crime perception. Police visibility does not influence the general deterrence of crime. In counties with high police presence, residents perceived a slightly lower risk of being arrested.

Taking into account the prevalence and the number of crimes solved by police, the proportion of crimes solved in America is dramatically lower than we realize. Clearance rates are inadequate for many reasons, including the fact that they are highly manipulable.

Papua New Guinea has a crime index of 80.3. In Papua New Guinea, crime, especially violent crime, is primarily fueled by rapid social, economic, and political changes. Raskol gangs engage in small and large-scale criminal activity and consist mainly of members with little education and few employment opportunities. Organized crime in the form of corruption is also common in major cities and largely contributes to the high crime rate.

Public opinion research documents that Americans attribute crime to multiple causes including unemployment, poverty, courts perceived as too lenient, insufficient police presence, and breakdown of family and moral values—reflecting a complex understanding that law enforcement alone is not the primary driver.

Multiple studies provide evidence that abandoned and disheveled buildings may signal to the community that illegal activities and violence can proceed unseen and unmonitored. A New York City study found that foreclosures increased violent crime by nearly 6 percent.

Crime rates are influenced by multiple factors including education, unemployment, PDRB (regional GDP), and per capita income. The study found that these four variables explain 68.6% of criminality variation, with the remaining 31.4% attributed to other variables not included in the research. The causes of crime in West Sumatra during 2011-2018 were identified as insufficient income to meet living needs, moral degradation, and drug abuse.

Here, as elsewhere in the police research literature, data drawn from single-agency studies provide only weak results. This highlights limitations in linking weak law enforcement directly to crime causation broadly.

Research on drug abuse crimes in Surakarta identified three primary causal factors: environment, dependency, and family. Law enforcement responses included preventive, repressive, and persuasive efforts, indicating that while enforcement plays a role, it is one of multiple intervention strategies addressing underlying causes rather than the primary cause of crime.

The effectiveness of law enforcement in society is influenced by several factors: legal norms (regulations), law enforcement apparatus, and other systemic elements. This indicates that law enforcement effectiveness is multifactorial rather than being the primary determinant of crime causation.

The 2018 NAS report on proactive policing found consistent evidence that certain focused policing strategies, such as hot spots policing, reduce crime, but evidence for community policing's crime prevention benefits is weaker and inconsistent. This suggests policing matters but is not the primary or sole cause of crime worldwide.

This thesis examines causal factors of violent crime against children by parents, law enforcement responses, and prevention efforts. The research structure distinguishes between causal factors and law enforcement mechanisms, treating them as separate analytical categories rather than positioning weak enforcement as the primary cause.