There's a very interesting thought experiment devised by the human rights lawyer Clive Stafford Smitg and outlined at the end of the excellent book "So You've Been Publicly Shamed" by Jon Ronson. Quoting from the book; “Let me ask you three questions,” he said. “And then you’ll see it my way. Question One: What’s the worst thing that you have ever done to someone? It’s okay. You don’t have to confess it out loud. Que…
Reason #1: The vast majority of people haven't been victim to something that's put someone in prison anyway.
Reason #2: At most, it would seem the 'solution' to the thought experiment is changes to legislation; not "scrap it all!"