Giving gang members jobs might well work--provided the jobs are behind walls, concertina wire, patrolled by individuals with training and rifles, and involve taking the individuals in question off the streets.
Unfortunately, that's not going to happen. First of all, since it's Chicago, it's far more likely that the individuals saying that they're only violent because their lives suck* will be handed the jobs and privileges taken from the law-abiding. They are, after all, helpless victims of the welfare culture that removed productive role-models (hard-working fathers) from the home in the 60's and 70's.
Second, and most importantly, these are criminals, and government only wants to prevent the law abiding from using violence to defend ourselves from the violent. Only the law-abiding are a threat to the government.
After all, what is our current government but a "legal" gang?
10 minutes ago