If we compare west european countries with Africa, sure, it doesn't say much. BUt USA having approximately 10 times more prisoners per capita than Germany, well, I think it says sth about both of those countries.
What does it say? It can state that US education or immigrationpolicies are crap. Nothing else really. Being the "world leader" brings a lot of shit a long with it aswell, some shit that countries like Germany barely ever have to touch. And thats not always the countries own fault. Im not saying that they arent incompentent. God no, they so are.
But when it comes down to it, slums filled with gangs are almost impossible to avoid for the US, kinda like cocaneproduction in South-America is almost impossible to stop, nomatter what policies and countries work together to stop it.