Well, holding one person responsible, for the actions of another, is a very slippery slope.

It's a frightening idea...

I really don't think one person should be held responsible for the actions/decisions of another person, in most cases.

Firstly, no parent is ever around their child 24/7.

The child has to go out to school at some point, and play with others their age, at which point that child has to make decisions on their behavior, on their own.

Also, just to give an extreme example:

You could have 2 nearly perfect, extremely loving, extremely supportive, incredible parents raising their child...

But through an accident of genetics, let us say their child is missing that portion near the front of their brain, which is responsible for empathy.

Let us then say, that as a young teenager this child then goes on to lure/kill another kid his/her age, just to see "what it felt like" as many a depraved psychopath/sociopath has depressingly done, without any real sense of empathy.

Again, that's an extreme example above, of course, but there is a whole massive range/spectrum of biologically based brain disorders, learning disabilities, or issues such as lower IQ, that affect the decision kids make.

Or even more simply... you can easily have a situation of an extremely supportive/loving household, with an intelligent kid, that has no psychological issues, just suddenly, stupidly make a dumb-@ss decision or move.

I've also recently read how it appears the brain of youth, does not fully mature/develop until their early to mid 20's!

That alone can fuel bad decisions in kids/youth, who come from loving/supportive homes.

FINALLY... of course there are some insanely harsh, or neglectful, or violent/abusive parents that do damage their children psychologically, and in those cases share a LARGE portion of the blame of any bad decision their child will make.