The more I read about this situation, the more it looks like one of those terrible tragedies where nobody "wins." You have a terrified old man, possibly with some cognitive impairments (we dont' know), but living in an area where two households rejected even call for help when an injured teenager came to their door. Then you have that rare kid, the minority teenager who really did lead his orchestra to the State finals (with an honorable mention), really is a full honor student at the top of his class, and was really picking up his siblings and got lost.
Did he try to open the wrong door? We don't know yet. Is his being alive a true miracle and an even greater one that his doctors say he will recover, and they can't explain why he isn't dead or brain dead? I think the old man needs to be fully medically evaluated and, if found to be in any stage of dementia, to be sent to a nursing home, possibly one for the criminally insane, if the judge feels he's too dangerous now for a regular one. Sure, try him if he's all there, but realize he's simply going into the senior facility at a State or Federal Prison.
Again, no one "wins" here; the teenager sadly is a "gift" to those who would use this to riot and otherwise "burn it all down." The old man was possibly terrified by incidents near or around where he was living (or, as someone suggested, a veteran who, in great old age, reacted to what his brain saw as a threat. I keep wondering, does he even have any family?
Sad, very, very sad.