> There are a few different strains of thought when it comes to opposition to private prisons, but I believe the common denominator is that they create a perverse incentive. They turn prisons into businesses—the more prisoners, the better.

The same criticism can be applied towards forced prison labour, and yet, it is explicitly permitted by the thirteenth amendment. (And is commonly used in state prisons.)

Just because a profit incentive falls in the hands of the state's coffers, as opposed to some corporation, does not mean the incentive is not perverse.