That’s a terribly bold claim that needs to be backed up by numbers.
As one counterexample, Mexico’s prison population is steadily rising, not declining.
Also, El Salvador has led a huge crackdown on crime that has led to a massive increase in prison population and a steep decline in homicide rates. Some other Latin American countries are copying the “Bukele model”, with mixed results.
https://www.statista.com/statistics/1280844/prison-population-mexico/