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James_K comments on Harry Potter and the Methods of Rationality discussion thread, part 5 - Less Wrong
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I believe Harry considers some punishments completely out of bounds, too severe for anyone. Certainly I do. The following may have no connection to the real reasons for this; but even without Many-Worlds you have a non-zero probability of personally suffering any possible punishment. Legally allowing a given punishment for anyone seems to produce a non-zero increase in this probability (even in a world without Polyjuice). Some possible punishments may have such negative utility for you that a course of action which avoids such increases, but which almost certainly leads to your death, would still have positive utility. Azkaban seems like a good candidate for such a punishment.
Furthermore even if one is a pure consequentialist, there may be a case for acting like a deontologist in some cases. While a perfectly rational entity can properly weight costs and benefits, people can't. Chances are if a person's moral code says "it's a good idea to subject some people to mind rape for decades" that person has made a mistake, and one should account for that.