The second premise you are avoiding is that the government can define, for every child, what constitutes misuse.
You are advocating thought crime. You do not have my support.
My government cannot adequately manage responsibility for my cupboards. It therefore shall not have authority over them.
Anyway, ultimately it's best effort. No security is flawless, but if it stops 99% or more of cases it's better than 0%.
That's how you sound.
The government already defines what misuse is both for children and adults, defines responsibility for a lot of things even in your cupboard, and has been doing so for as governments have been a thing. And I don’t think you understand what “thought crime” is.
You won’t hear me say this too often but next time use an LLM to write your comments, any LLM will do, can only get better.