In both absolute and per capita terms, the US imprisons more of its population than any other country in the world. At the same time, however, we have one of the lowest rates of psychiatric institutionalization in the developed world. Perhaps there is a connection here: the people that should otherwise be receiving psychological help are instead being locked away, and such treatment only worsens their behavior (hence why we also have a high rate of re-offenders). Imagine how many crimes could be prevented if we had a better mental health infrastructure. Just a thought.