There is plenty of information about a child that, if made known to the parents, would wreak havoc on the child's life. For example, through metadata alone, it

There is plenty of information about a child that, if made known to the parents, would wreak havoc on the child's life. For example, through metadata alone, it could be possible to identify that a child has LGBTQA interests/associations/etc. There are plenty of children where the parents knowing this could lead to them being punished harshly, or even on the streets. I don't think automatically sharing everything with parents is the expectation/panacea you seem to imply it would be. Admittedly, I don't think the schools should have this information either.