Being in jail doesn't stop crimes from happening, it just puts a lot of criminals in one place.

People kill in jail. Steal. Rape. Abuse. Maim. Torture. People make a business of smuggling drugs into jail. There are gangs.

This stuff happens even in low security facilities, but even more so in moderate or high. The people who get put into low security facilities get put there for white collar crimes like fraud and DUIs. But in moderate and high security facilities you have people who commit multiple violent crimes mixed with first time offenders.

Jail is not about serving your time, it's about surviving it. =|