I'm not saying locking criminals up is bad, it's actually the right thing to do. But, putting them in a situation where they way outnumber their guards or where an outside force could come in and litteraly have their own little army just waiting to be freed (that will hate everyone). Yeah, can't see that not coming to bite them. Better to spread them out over multiple well staffed facilities and show just a bit of humanity. Or, just be honest and do the death penalty for those deserving.