It's the same if not better compared to the alternative, right? Person isn't bothering society and the state isn't subsidizing their imprisonment. Exiling people kinda sounds like the best option unless you like punishment.
I really don't like the idea of keeping people in boxes, and agree that even in the case of the most wretched human being I'd rather have them free and alone than locked in a box without a goal besides punishment. However, this man's crime was human trafficing. Do you really want a human trafficer living in the woods like some kind of troll monster, ready to capture more children? That sounds like it could potentially result in more captive humans, rather than less.
