It’s awfully sure about statutory sentencing.
Give it another 50 years or so and statutory sentencing probably go away. It's a system that moves so slowly that it can take multiple generations to correct wrongs. I think that's considered a feature for long-term stability, but it seems like poor design to me.
If you look at a long enough timescale, we are trending in the right direction.
If it makes you feel better, you can think of the non-violent imprisoned as grains of sand on the scales of justice. Your persistent outrage helps push for change in the same way.