Well, ou go to San Quentin or another max security lock-up? Your chances of getting shanked in the hall are way better. That was for murderers, rapists, really bad people. Laws on Earth depend on where you are, but mostly it tends to be more toward the mercy side. You know, people screw up but they're basically decent.

[He screwed up, but he's basically decent. He likes to think.]

...it's better in theory than in practice sometimes, but it also means you don't get shot for stupid things like graffiti or stealing a car. I guess if you could just put them in a box in space, it might be different, though. As long as you don't plan on ever letting them out.