Earlier quoted context omitted.
Source? Incarceration rate seems to be going down in western countries: https://news.un.org/en/story/2021/07/1096042
The scale of incarceration is still unprecedented. A reduction by 27 percent doesn't change that. Imprisonment was an extremely rare phenomenon for much of history (as was police, for that matter). Today's incarceration rates would have to be reduced by 99+% in order to reach pre-modern levels, where large cities often had only a handful of cells in total, and rural areas had none at all.
So, one may perceive incarceration as an improvement.