I don't really see how that is relevant? Isn't that law making a parent responsible for actions their child commits that hurt others? Child protection laws like preventing child labour, not selling alcohol/cigarettes, etc aren't this.
its an example of holding the parent responsible when the child breaks a law.
if accessing social media below 16 becomes illegal, this is a literal perfect example of holding parents accountable for their kids illegal activity. you can't possibly get more relevant.
there is no reason to shift parental responsibility onto tech companies. we have existing laws that can be used as templates for social media bans.
do they go after the liquor store and just ignore the parents letting their kids drink?
To be honest I did some brief searching and couldn't find anything! The parent will be liable if someone at your home drinks and drives home drunk, but I couldn't find anything specific about children consuming alcohol alone. It is only illegal to sell alcohol to minor, underage alcohol consumption is explicitly legal if supplied and supervised by an adult.
Now I'm sure if the child were to be young enough other child abuse laws could come into play, but it looks to be exceedingly rare.
is that enough examples to satisfy your initial request?
(which was a request for examples of the extremely broad statement: "We used to hold parents liable.")
I know your point is talking about point 2, but I believe OPs comment was about point 1. But I also still don't know what the "used to" means in the original, do we not anymore?