Is it more important to punish past crimes or to prevent future crimes, if you could only do one?

I don't think that punishing past crimes is nearly as important as preventing future crimes. Looking forward to me is a much more viable strategy and much more rewarding. The idea that punishing past crimes will somehow prevent future crimes has unfortunately proven to be false for the most part.

Is it more important to punish past crimes or to prevent future crimes, if you could only do one?
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