[aklyw]

If there is no question, why is this dehumanizing practice completely illegal in many European countries?

The productive part of the population is treated like children in the US. Daddy gives you health insurance and reads you diary. If daddy no longer likes you, daddy cancels you health insurance but still reads your mail.

[Symbiote]

I think the UN Convention on the Rights of the Child, which includes a right to privacy, should restrict "daddy" from reading his child's diary, although it's not clear to me if there are limitations to this.