"Fiscally liable" is probably accurate, but "legally responsible" has limits. To get jail time the parents would have to be charged with a crime, and I'm not sure what crime they could be charged with. (Though district attourneys are notorious for their "creative" interpretation of the law.)
Negligent homicide? Hmm. That would be a tough sell to a jury, since the boy was hunting legally. Perhaps there is more to the story- if, for example, the boy in question had a notorious reputation for poor judgement or aggressive behavior or a psychiatric history, or whatever, in which case letting him go off into the woods with a loaded firearm and no adult supervision might be considered negligent. But I didn't hear about any such situation.
> What punishment could the courts inflict that would equal or exceed him having to live the rest of his life with this event?
If he is a good kid with a normal human psyche, who commited an honest though horrible mistake? Not much. If he is a little beast who just wanted to see if he could get away with killing someone and claiming it was an "accident"? Quite a bit.
Mind you, I have no reason to suspect the latter- I'm merely brainstorming. Most likely he is just a typically irresponsible teenager who made a bad call with horrific consequences. Certainly, most Western justice systems make allowances to the effect that children are not fully responsible for their actions in the way that competent adults are. That is why we have juvenile courts, etc.
But would you, Bob, advocate no criminal decisions against ANYONE who was "really sorry" about what he did? That only goes so far, too. Our courts are not only about rehabilitation, no matter what some on the left would have you beleive. Nor are the courts always about punishment, as some on the right would have you beleive. But sometimes they have to at least be about justice.
I am certain that others will disagree but, from what little I know of this case, IMHO justice dictates that the kid suffer materially a bit. (If I were the person he killed I know that I would want the careless little snit to suffer, if only to teach him to be more careful.) Plus, if he really IS a good kid, this will help him. The truly penitent are often haunted when they "get away" with something this horrible. They NEED to be punished if only symbolically to fully come to terms with what they have done and move on with their lives. It provides closure.