It seems all of you think that hacking is a uber big crime...
He is 17 years old, so has no responsibility for what is doing, his parents are responsible. And what's the problem, he made a joke, so what?
Maybe there are people here that will disagree, but there are two types of hackers. First is "good" which tests his abilities and when he manages to hack a system, reports to the system administrator for the breach, so the sysadmin will be able to fix the flaw. Second is "bad" which, can be harmless, or commercial or for popularity. This case is harmless...
There have been countless times that swat has entered the wrong house for whatever reason and been faced with innocent people drawing guns because they are scared and these people end up full of holes.
This is far from harmless and is not funny and regardless if hes blind or not deserves some very severe punishment.