What punishment would you give to the baddest people on earth? For someone that's evil and done horrific things, the bible calls for an eye for an eye (Book of Exodus 21:23–27).
https://www.biblegateway.com/passage/?search=Exodus 21&version=KJV
Maybe if these evil people didn't commit the crimes they did, then there would be no need for justice, but they did and people deserve justice, so do the victims.
The reason USA has so much crime is because people aren't being punished for the crimes they commited. They will be judged at some point though and if not in this life then they will be at the end of their lifes. Nobody beats the reaper and nobody escapes the justice of God.