If something is "kind and normal" as opposed to "cruel and unusual", is it punishment? What is "cruel and unusual"? Is punishment effective if we lack free will? Would punishment be more effective if it were administered in a Starship Troopers fashion?
Comments
In general, a lot of punishment is justified on the basis of so-called "retributive justice", which I'd say is little different from revenge and is plainly immoral. I can see where the idea comes from, as the capacity for revenge is something that makes sense from an evolutionary perspective, similarly to how the tit for tat strategy is effective in the Iterated Prisoner's Dilemma. However, simply because we evolved with it does not make it moral - we can do better.
Spraying a cat with a bottle of water so it will stop eating the spider plant is punishment. It is uncomfortable, but it works in teaching.
While it may ruffle some feathers I can't say I disagree with Mr. Heinlein too much. It is something that should be well thought out however. Doling out pain just for pain sake isn't the way. Nor is punishment for the sake of revenge. Doing so with the express purpose behaviour modification is in the right direction however, I can't think of a way to implement such a thing at all. Too many times in our history it has gone horribly wrong.
I think a part of the issue is the nature of enforcement. All infractions cannot be prosecuted, and that encourages deterrent punishments since you're relying on everyone to police themselves to a certain extent. If 99% of people get away with breaking a law, then the punishment needs to be severe enough to prevent the less moral members of our society from playing the odds.
Another part of the issue is privacy. I think a majority of people actually prefer lower enforcement of more severe punishments because that leaves them free to make the choice to break laws based on their own individual judgement. I saw a panel on nanotechnology that raised the privacy issue. Given infinite video data storage (thanks to nanotechnology) would the panelists support using 24/7 observation to enforce car-seat laws for children. Its not an issue of personal judgement, because that person is responsible for the safety of a minor and not just themselves. It wasn't an issue of deterrence, because the punishment for infractions was a small fine every time the law was broken as opposed to a large fine when it was caught by spot-checking. No one could make a reasonable argument against the necessity of car-seats, yet all but one of the panelists was uncomfortable with round-the-clock (assumed secure and trustworthy) surveillance for this explicit and sole purpose, and the only one who was in favor was the one who advocated an Orwellian approach to surveillance as a response to 9/11 anyway.
Obviously I believe a rehabilitative approach to punishment is much better than a deterrent one, and in my opinion the corporal punishments we now forgo in favor of imprisonment and fines are just one side of the deterrent coin. I think we should go the other direction entirely.