Based on the shooting last week, it would seem that such laws do not prevent children from accessing firearms.
I'm not really disagreeing with what you said. And I'm not directing this at you.
Laws (in this type of context) don't prevent things from happening.
Laws against running red lights don't prevent them from happening.
The laws discourage behavior that tends to lead to bad things happening.
In a practical sense, these types of laws punish people whos lack of responsible behavior lead to bad things happening and serve as notice to others that such behavior has consequences.
All 50 states have some sort of parental liability laws. If anyone doest like it, don't be a parent or move out of the US, or both.
Those trying to rationalize why they shouldn't be responsible just show that they're not in the 1st place.
Parents have responsibility to their kids, for their kids, and for some of the actions of their kids - period.
Quit trying to pass the buck and take no responsibility..... that mentality is a part of how we got to the point we are now.
Having said that, I think there is quite enough laws on the books as things to stand now. We don't need more.
I don't know enough about the kid or the father in this case to pass judgement.