Re: going down
When you were 16 (the crime was 18 months ago), did you possess the executive functions to properly assess the consequences of your actions?
No, not every action, and juvenile poor judgement leads many young people into some sort of minor scrape or other, me included. But you don't need nuanced judgement to realize that it is wrong to commit a major crime, and that doing so will have major repercussions. Therefore, he bears some responsibility for what he has done. How much responsibility depends on him, and the circs of the case. But I take your point some forgiveness is appropriate and with it he might still have a good life.