By “ban” you mean the government that is providing a taxpayer-funded service choosing what content is provided as part of that service by taxpayer-paid employees, right?
I think they mean the government providing a taxpayer-funded service letting citizens bring private lawsuits instead of going through the regular channels for addressing errors if deviations from curricula occur because for some reason those channels (which are also government-defined) are inadequate, yet cannot be improved.
We'd best not pull the thread on why they can't be improved.
We'd best not pull the thread on why they can't be improved.