> "Letting parent sue" is a very American way to go about it, but exploiting kids underdeveloped brain should be illegal.

Giving people cause of action to sue you for something is making the thing illegal. Civil law is law. And it is law that can be enforced even when the police and prosecutors are hostile or indifferent to you as a victim and sympathetic to the perpetrator, which is something that is not true of criminal law, much to the detriment of marginalized communities.

Of course, it also costs money to enforce it, which makes it harder for marginalized communities, so it's not all sunlight and roses.