It would be great if this didn't get lost in the hundreds of comments.

If you want a good understanding of Chicago violence check out this documentary:

Smile by Marquis Daisy.

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Smile: A film about pain, struggle, and betrayal, in America's "murder capital," Chicago.
This documentary was released prior to the Ferguson shootings, and was done by a film maker who went on to produce the ESPN 30 for 30, Rand University.

I felt Rand University was so good at the time, I looked to see if Marquis Daisy had any other work out. Smile was what I found and was stunned by the honesty of the film.

It definitely deserves to be watched by more people.