[4][5][6] However, some of the factors contributing to these trends include imprisonment for migration-related offenses,[7] systemic bias in policing and judicial processes, which may inflate crime statistics for immigrant populations relative to their real criminal rate.
[69][70] According to Olivier Roy in 2017 analyzing the previous two decades of terrorism in France, the typical jihadist is a second-generation immigrant or convert who after a period of petty crime was radicalized in prison.
According to the authors, "weak parental social control and risk routines, such as staying out late, appear to partly explain the immigrant youths' higher delinquency", and "the relevance of socioeconomic factors was modest".
[97] Aoki and Yasuyuki's research show that data that is frequently shown regarding French immigration and crime is misleading, as it does not take discrimination and economic hardships into account as a motivator for criminal acts.
[101] Published in 2017, the first comprehensive study of the social effects of the one million refugees going to Germany found that it caused "very small increases in crime in particular with respect to drug offenses and fare-dodging.
[104] A 2019 study by Otto von Guericke University Magdeburg economists found that the arrival of nearly one million refugees in 2015 did not increase the likelihood that Germans would be the victims of crime.
[105] A January 2018 Zurich University of Applied Sciences study commissioned by the German government attributed over 90% of a 10% overall rise in violent crime from to 2015 to 2016 in Lower Saxony to refugees.
[114] In 2018, the interior ministry's report "Criminality in context with immigration" (German: Kriminalität im Kontext von Zuwanderung)[115] for the first time summarized and singled out all people who entered Germany via the asylum system.
Hans-Jörg Albrecht, director of the Max Planck Institute for Foreign and International Criminal law in Freiburg, stated that the "one over-riding factor in youth crime [was] peer group pressure.
[131] A study of Italy before and after the January 2007 European Union enlargement found that giving legal status to the previously illegal immigrants from the new EU members states led to a "50 percent reduction in recidivism".
[134] Prison population data may not give a reliable picture of immigrants' involvement in criminal activity due to different bail and sentencing decisions for foreigners.
[139] Analysis of police data for 2002 by ethnicity showed that 37.5 percent of all crime suspects living in the Netherlands were of foreign origin (including those of the second generation), almost twice as high as the share of immigrants in the Dutch population.
The authors also find "that a higher proportions of American, non-UE European, and African immigrants tend to widen the crime differential, the effect being larger for the latter ones".
[173][174] In 2018, Swedish Television investigative journalism show Uppdrag Granskning analysed the total of 843 district court cases from the five preceding years and found that 58% of all convicted of rape had a foreign background and 40% were born in the Middle East and Africa, with young men from Afghanistan numbering 45 stood out as being the most next most common country of birth after Sweden.
[180][181][182][183][184] Jerzy Sarnecki, a criminologist at the University of Stockholm, said foreign-born residents are twice as likely to be registered for a crime as native Swedes but that other factors beyond place of birth are at play, such as education level and poverty, and that similar trends occur in European countries that have not taken in a lot of immigrants in recent years.
[185] According to Felipe Estrada, professor of criminology at Stockholm University, this shows how the media gives disproportionate attention to and exaggerates the alleged criminal involvement of asylum seekers and refugees.
[190] According to professor Christian Diesen, a foreigner may have a lower threshold to commit sexual assault due to having grown up in a misogynist culture where all women outside the home are interpreted as available.
[198] A 1996 report by the Swedish National Council for Crime Prevention determined that between 1985 and 1989 individuals born in Iraq, North Africa (Algeria, Libya, Morocco and Tunisia), Africa (excluding Uganda and the North African countries), other Middle East (Jordan, Palestine, Syria), Iran and Eastern Europe (Romania, Bulgaria) were convicted of rape at rates 20, 23, 17, 9, 10 and 18 greater than individuals born in Sweden respectively.
[201] An analysis of historical courtroom records suggests that despite higher rates of arrest, immigrants were not systematically disadvantaged by the British court system in the eighteenth and nineteenth centuries.
One study finds that, "major government commissions on immigration and crime in the early twentieth century relied on evidence that suffered from aggregation bias and the absence of accurate population data, which led them to present partial and sometimes misleading views of the immigrant-native criminality comparison.
[254] A 2015 study estimated that Mexican immigration to metropolitan statistical areas significantly increased aggravated assaults and decreased rape, larceny and motor vehicle theft.
"[262] Research finds that Secure Communities, an immigration enforcement program that led to a quarter of a million of detentions, had no observable impact on the crime rate.
"[54] Research has found no statistically significant effect on crime for sanctuary cities—which adopt policies designed to not prosecute people solely for being an undocumented immigrant.
[271] According to a review by The Washington Post fact-checker of the available research and evidence, there is nothing to support President Trump's claim that "the vast majority of individuals convicted of terrorism-related offenses since 9/11 came here from outside of our country.
"[272] According to a report by the New America foundation, of the individuals credibly involved in radical Islamist-inspired activity in the United States since 9/11, the large majority were US-born citizens, not immigrants.
[274][237] Tren de Aragua began emerging throughout the United States during the administration of President Joe Biden, which saw a surge of migrants crossing the Mexico-U.S. border, particularly from Venezuela.
[275] Telemundo, citing multiple criminal cases against suspected members of the gang, wrote in March 2024 that it shows "an increasingly widespread presence of the band also in the United States.
[278] In 2024, U.S. officials at the U.S.-Mexico border implemented enhanced interviews of single Venezuelan male migrants in order to screen for Tren de Aragua members.
By the mid-2000s and the outbreak of the Cronulla riots, sensationalist broadcast and tabloid media representations had reinforced existing stereotypes of immigrant communities as criminal entities and ethnic enclaves as violent and dangerous areas.
Indeed, the failure of French security in 2015 was likely due to police tactics that intimidated rather than welcomed the children of immigrants—an approach that makes it hard to obtain crucial information from community members about potential threats.