So which crimes would you take off the books and what percent of prisoners would that remove?
We can start with the drug war, things like civil forfeiture, and go on from there. You might be interested in this book.
The problems with the US criminal justice system go much deeper than just the abundance of laws, of course.
As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.