The prosecution seeks the max, in this case 15 years, to persuade the defendant to plea the case out. His options are to try and defend himself with no resources (a public defender is worth next to nothing) or make a deal. The prosecutor and judge get to look "tough on computer crime" which will help their resume when looking to advance their careers, and the kid gets to have the end of his 20's. All that is left out is "justice", and by that I mean let the punishment fit the crime. And now society must carry the debt, both economically (housing the kid) and socially - will our streets be safer over the course of his lifetime once he gets churned out of prison.