You are correct in stating that insurgencies act a lot like gangs and criminal elements. In fact insurgents do not have a goal of winning in war, just as gangs dont want to over-through the government. The insurgents "win" if the war is protracted. They simply want chaos because chaos provides utility--it allows them to operate unabated and substantiates that, in reality or in appearance, the government cannot provide governance--rule of law, security, public safety, economic opportunity, essential services...
Several years ago, I wrote a paper that addresses the Insurgency Paradigm. I have attached it for your use. On page three the paper addresses the similarities of insurgencies and gangs/criminal elements. It also addresses the concept of "resource scarcity" and violence. I hope this helps.
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