Empower inmates to give back to the society they burden by enabling them to work the fields where immigrant workers would.
Since our tax dollars go towards their rehabilitation and encarceration, let them work the fields at a much smaller wage.
This will lessen food prices and thus lessen the burden on those they already burden.
I think that if you give them a purpose that will help them more than if you lock them up with nothing to do. A bored mind is a dangerous mind.