That just makes it more easy to clean house. Prison riots are usually used as a distraction to carry out hits or if the conditions get unlivable. No one is rioting on a whim because all that gets you is more charges, or straight killed when you try to take on heavily armed, armoured SWAT officers trained for riots, and will simply fill the prison with gas and shoot anyone who resists.

There is a reason concentration camp revolts were extremely rare. It is best to not let it get to that situation to begin with.