Your son needs help that prison can't provide. He needs someone who can find out why he needs to do what he is doing. Someone who can help him stop his self destruction. He needs reform, but not a prison sentence. I hope you can convince your son's lawyer to seek medical/psychological help for him - not harsh punishment. Your son needs to see what he is doing, and he needs to want to improve.
My most sincere wishes for a good outcome and a bright future for your son.
birte