In an ideal world, parents would be good parents, know what their kids are up to, install parental controls on their digital devices (software solutions out there range from free/bundled to not expensive), have conversations with kids about what's on the internet and what to avoid.

Government overreach is not the answer, it's a plaster (and an excuse for more surveillance which is arguably the primary factor) over bad parenting. In the UK at least, all major ISPs and mobile providers have a basic parental/adult-content control package that is set-up by default (opt-out by the bill payer). Albeit trivial to get around with a VPN/proxy or changing DNS servers etc.

Kids will be kids as well. They'll get around restrictions, they're clever, they talk with their mates in the playground about this sort of thing. Especially teens.

You roll out the ‘bad parents’ trope then immediately admit bypassing parental controls is trivial.