So say one of the 50% of children that have unrestricted access goes somewhere they shouldn't, or interacts with people they shouldn't. How is it detected so the parents can be held liable? What does the implementation look like to you?
How is it detected? A police report is for after it's detected.
Preventing the crime from happening is out of scope of the government, as it should be.
The affected parties are unsupervised children, who are accessing adult spaces and content. Are you saying the children will tell on themselves?
Maybe take a moment to re-read this comment chain.