We can always do some hedonic calculus. I don't think it's a perfect way to measure morality, but it may suit our needs for the moment. Revenge generally only benefits you and only you, and maybe some immediate family or friends, in an intangible way and for a brief period of time, and you may eventually regret it. Rehabilitation benefits society as a whole if it's successful, and has much more long lasting effects both for the person rehabilitated and for the rest of the world.
Thus, rehabilitation wins on the fronts of duration, fecundity, purity, and extent, and probably loses in intensity and remoteness. Certainty might be a bit of a toss up for either one, to be honest - who's to say how much better you'll actually feel after you commit your act of revenge, or whether the rehabilitation will work? Therefore, I think Bentham and John Stuart Mill would agree that the rehabilitation option is the more morally right option, especially given that "extent" is generally considered the most important part of the equation.
</pretentious philosophy major>
Thus, rehabilitation wins on the fronts of duration, fecundity, purity, and extent, and probably loses in intensity and remoteness. Certainty might be a bit of a toss up for either one, to be honest - who's to say how much better you'll actually feel after you commit your act of revenge, or whether the rehabilitation will work? Therefore, I think Bentham and John Stuart Mill would agree that the rehabilitation option is the more morally right option, especially given that "extent" is generally considered the most important part of the equation.
</pretentious philosophy major>
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