Earlier quoted context omitted.
There are places where 20% of society (or more) are unemployed. They're not nice places. They're run by gangs or warlords. They're the kind of place where teenagers sit on steps and just wait for the wrong person to walk past them.
Do those places have gangs and warlords because they have 20%+ unemployment, or do they have 20%+ unemployment because they have gangs and warlords?
That said, I'm not particularly convinced that gangs and warlords would suppress employment (if anything, the more organized criminals tend to run protection rackets which sort of require people to have some income they can steal) however they are most certainly reducing the quality of life for people.
Unemployment causing gangs at least feels more plausible, however you seem to have plenty of areas with gang activity that have plenty of employment opportunities as well as social programs. Selling drugs almost certainly makes more money, but comes with much, much higher risks. I might guess that this is more about social mobility than it is about survival, but I don't want to try to over-simplify a complex issue.