Who would be Waluigi?

I’d agree, but only for crimes that aren’t fatal/serious enough. Deliberatly killing someone isn’t a thing society should forgive.

Counter question: Who wouldn’t benefit?

Keeping someone locked up for decades doesn’t solve a problem. It hides it. Some things can not be corrected and we need to come to terms with it.

If someone is causing such a massive problem, there ought to be a solution which isn’t letting people in the future deal with it after he is out of prison.