When nearly 40% of the violent crime is caused by 3% or less of the population, when any single one of them from that demographic declares he is leaving the United States, there is always a possibility of less violent crime taking place.
Granted, that person out of the 3% out of the six percent of black men who make up the population of the USA might be in the non criminal side of that 6%, but then, they aren’t the ones threatening to leave.
The 1 % of the population accountable for 63 % of all violent crime convictions!
Results:
A total of 93,642 individuals (3.9 %) had at least one violent conviction. The distribution of convictions was highly skewed; 24,342 persistent violent offenders (1.0 % of the total population) accounted for 63.2 % of all convictions.
Persistence in violence was associated with male sex (OR 2.5), personality disorder (OR 2.3), violent crime conviction before age 19 (OR 2.0), drug-related offenses (OR 1.9), nonviolent criminality (OR 1.9), substance use disorder (OR 1.9), and major mental disorder (OR 1.3).
Conclusions:
The majority of violent crimes are perpetrated by a small number of persistent violent offenders, typically males, characterized by early onset of violent criminality, substance abuse, personality disorders, and nonviolent criminality.
Keywords: Persistent offender, Violent crime, Population based, Nationwide registry, Mental health
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3969807/