My $0.02: there are several different functions person A can perform by punishing person B for some action C.
For example:
(a) lowering B's chances of performing C in the future
(b) lowering the chances of observers performing C
(c) encouraging observers to anti-identify with B
(d) encouraging observers who anti-identify with B to support A
(e) encouraging observers who identify with B to oppose A
IME, conversations about how prisons should work become really confused because people aren't very clear about which of those functions they endorse.
Personally, it seems clear to me that (b) is by far the most valuable of these goals. That said, prison policy has almost no influence on (b); law enforcement and courts are far more relevant, and their current implementation pretty much screens off the effects of prison policy.
People who are interested in (a) and also value B's continued existence will tend to be interested in punishment as a behavioral modification tool, and will happily set it aside in favor of more effective behavioral modification tools as science develops them.
People interested in (a) who don't value B's continued existence will be uninterested in punishment, since simply killing B is more efficient.
AFAICT, the folks who establish the policies that govern prisoner punishment (as distinct from prisoner restraint) are primarily motivated by the desire to obtain political support, which suggests minimizing (e) and maximizing (d), which does seem to be what most of our prison policies are designed to do. Maximizing (c) is one way to minimize (e), though there are many others.
Personally, it seems clear to me that (b) is by far the most valuable of these goals. That said, prison policy has almost no influence on (b); law enforcement and courts are far more relevant, and their current implementation pretty much screens off the effects of prison policy.
This isn't obvious at all. In particular if prisons were extremely nice, their deterrent effect would be much less no matter how law enforcement and the courts worked. One could argue that the policies in the current Overton window aren't significantly different from each other, but that argument would have to be made.
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