There are reasons for this problem. This is one of them: "Schools in inner-city areas are inferior to that in the rest of the country." The students learn nothing. This problem could be fixed but nothing is being done.

Wikipedia - Incarceration in the United States

In 2010, adult black non-Hispanic males were incarcerated at the rate of 4,347 inmates per 100,000 U.S. residents. Adult white males were incarcerated at the rate of 678 inmates per 100,000 U.S. residents. Adult Hispanic males were incarcerated at the rate of 1,755 inmates per 100,000 U.S. residents. (For female rates see the table below.) Asian Americans have lower incarceration rates than any other racial group, including whites.

Figure 1. Average rate of incarceration by race and ethnicity, per 100,000 population