The whole point is to NOT be equivalent. That is the principled objection to public school. For example:
https://duckduckgo.com/?q=trump+history+school+book&t=canoni...
About half the population would be offended by those textbooks. You're insisting on an equivalent education, which would mean teaching with that same bias. The whole point is to do otherwise.
One can find other examples in the way books treat the Vietnam war, the North American aboriginal population, LGBT, premarital sex, the causes of the Great Depression, unions, nationalized health care, the electoral college, the second amendment, Justice Clarence Thomas, Justice Ruth Ginsburg, and so many other political topics. History and sex-ed classes are deeply tied to politics.
You say that parents should be "not allowed to provide their children's with religious/libertarian dogma instead of an actual education", but many parents take the view that schools today are doing exactly that.
