As someone who is fortunate enough that most of my experience with the prison system has happened through Netflix, I took that to mean simply that when you’re in the same small space day after day, it gets boring. But providing prisoners with books offers so much more than relief from monotony.
According to a Baltimore Sun article about Maryland’s prison libraries:
Many who are within a year or two of release use library services to prepare for re-entry — to get their GED, to improve their vocabularies and language skills. The recidivism rate in the United States varies, from 50 percent to as high as 67 percent in some states, and there are two main reasons for that level of failure: the employment challenge facing ex-offenders on the outside and the lack of preparation for re-entry on the inside.