I have to wonder if there's a strong link to poverty or economic stagnation as well. With income disparity reportedly increasing by leaps and bounds, it's possible the crime of the last century and the recent violent uprisings in the US were all influenced by the economy.
It's intuitive, but I'm not sure if there's a causal link. The 20th century saw an incredible increase in income equality and that was the highest point in the recent crime wave. In fact, the increase in income inequality in the US over the last thirty years has coincided with the drastic decrease in violent crime, which is super interesting because it implies that those variables might be more independent than originally thought.
