Your entire argument is based on the fallacy that children knows exactly what they are doing, just because you think you did. You must get that this boy is not

Your entire argument is based on the fallacy that children knows exactly what they are doing, just because you think you did. You must get that this boy is not even a teenager yet. Destroying his life by throwing him into a prison will only result in him learning and befriending other troubled children. This will not do anyone any good. The solution I would suggest is a minor punishment, say a week or so in prison - just to scare the living hell out of him. Meanwhile having a professional evaluate his situation and suggest a reasonable recovery plan (therapy, forced change of school in order to find new friends, computer banishment, or whatever).