The death penalty does act as a deterrent to some people. The fear of getting raped is all some others need. Everyone is different, so different punishments have different effects. Does it stop all of them? Obviously not.
Some criminals can be rehibilitated, but anyone who commits a pathological crime cant be. Child molesters, serial killers, serial rapists, people who commit crimes for the sheer thrill of it... Most of those people are sociopaths. The groundwork for being a good person does not exist in those people.
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