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If Mallory O’Brien, executive director of the Milwaukee Homicide Review Commission, looked closer to home, looking at Milwaukee homicide statistics:

Milwaukee, with a population of just less than 600,000, is 40 percent African-American and 37 percent white. The 2011 Homicide Review Commission reports there were 86 homicides that year, with 93 percent of the suspects black males.
Overall, the homicide rate was 14.5 per 100,000 residents, and the nonfatal shooting rate was 79.5 per 100,000 residents. However, when broken down by race, “the homicide rate per black residents is 27.9 per 100,000 compared to 9.7 per 100,000 Latino residents and 1.7 per 100,000 White residents.”
The report concludes that “of the 2011 homicide victims, 77 percent (66) had a least one prior arrest and of the known 2011 homicide suspects 90 percent (74) had at least one prior arrest.”
Similar trends were found for nonfatal shooting victims and suspects.

Most "gun homicides" are people with criminal histories shooting other criminals. Most of the rest are criminals shooting regular citizens, or regular citizens shooting criminals in self defense.

Keep in mind please that crime is Hierarchical Counted. If a man kidnaps, rapes, robs, and kills a woman only the murder charge is counted. That leaves 3 additional crimes to be flushed down the toilet, and are not part of stats.

In both these statewide studies only 45% of prison population were studied, so you are going to have to multiply out the actual numbers if you want 100%.

Recidivism
http://www.bjs.gov/index.cfm?ty=tp&tid=17
These offenders had accumulated 4.1 million arrest charges before their most recent imprisonment and another 744,000 charges within 3 years of release.

Older study, but invaluable info. Probation and Parole: https://www.ncjrs.gov/txtfiles/ppvsp91.txt
Keep in mind the sampling was just 45%, they originally committed 25,900 crimes, when placed early release under ‘community’ supervision for parole and probation they then committed another 74,400 new crimes. That folks adds up to 100,300 crimes, and many times more than in victims. As there are multiple people affected when a child is raped or a person murdered.

This is an older study as there are no newer ones, this gives you a big idea of just how many additional early release of criminals to parole and probation cause.