https://en.wikipedia.org/wiki/Crime_in_Chicago
"Chicago has an estimated population of over 100,000 active gang members from nearly 60 factions. Gang warfare and retaliation is common in Chicago. Gangs were responsible for 61% of the homicides in Chicago in 2011."
Former Chicago Police Superintendent Garry McCarthy blames Chicago's gang culture for its high rates of homicide and other violent crime, stating "It's very frustrating to know that it's like 7% of the population causes 80% of the violent crime..."
Again, some data science mumbojumbo is preventing actual, logical solutions. El Salvador put gang members, in totality, in jail. Now it has the LOWEST homicide rate in Latin America - it had the HIGHEST before.
So yeah, the anti-carceration movement in the US has caused the deaths of more people, African-Americans in particular, than any terrorist organization.