Rikers is a great example of a clearly flawed jail system, with inmates getting stuck for years without trial and sometimes killing themselves after losing hope.
Having recently gone through the judicial system as a white male, I can't image being a black man going through the same thing. I was able to buy my freedom, buy excuses, buy a lawyer to get me out of everything. When an oppressed people who already starts out behind falls into the same trap, there's little left for them to do.
Interesting read: https://www.nytimes.com/2017/04/05/nyregion/rikers-island-pr...