Then you probably don't. If you feel that way, you probably regret what you did - you either didn't want to do it or you've since realised it was wrong and you wouldn't do it again.
The people who really deserve it are the people who destroyed lives and families just for fun, because they thought they were above our laws and morals. Those people would do it again, if they knew they wouldn't be caught, and they don't feel like they deserve punishment.