or Escape from New York.  take a remote island and drop these folks off to fend as well as they can on their own. grow their own food, set up their own hierarchy, tend to their own medical - drop a doctor whose done a dirty deed. throw stone cold killers, serial rapists ,  and any and all pedophiles.  no guards, no communication. there most likely won't be an over- crowding problem... a high turnover and natural selection. but, of course the court system would need an overhaul and be more accurate  -work to see that very, very few innocents found themselves in such a place.
 that may be a crime deterrent. prisons are second homes to some people.