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> Do we really, as a society, need revenge? "Yes" in the sense it's a deterrent in place of revenge. It's on purpose and codified in the law for that reason.
The revenge part of justice isn't there because it benefits the convicted's rehabilitation. It's there because it increases the ambient peace of society to have the state take upon itself (and codify, and normalize) the very human desire to seek a balancing of the scales by bringing someone low who brought you low.
We punish criminals with discomfort, constraint, and loss of freedom so that their victims don't hunt them down and cave in their skulls with a two-by-four. We give them what's coming to them so they don't get what's coming to them directly from those they've wronged.