Is it morally acceptable to punish? And at what stage does punishment turn to

Is it morally acceptable to punish? And at what stage does punishment turn to

Is it morally acceptable to punish? And at what stage does punishment turn to revenge? Comparing something like lex talionis (which seems like revenge) with rehabilitative/correctional systems (which seem restorative), it seems that certain forms of punishment are more ethical than others.

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