"There is only one subject-matter for education, and that is life in all its manifestations." Alfred North Whitehead (1861-1947) British philosopher and theoretical mathematician.
This sampling illustrates the wide range of disagreement regarding a "good" education. And this disagreement readily transitions into a wide range of conflicts and controversies. Yes, there is wide agreement that education involves the acquisition of basic skills such as reading, writing and arithmetic. But even here there is disagreement regarding how they should be taught — much less the ends these basic skills should serve.
So whatever content and methodology educators choose will be controversial — if it isn't neutered. This is why school higher-ups stick to vague generalizations regarding instructional goals and objectives. But trouble still arises when teachers attempt to add detail. Adding detail is what classroom teachers must do because they must create actual lessons. And remember, if that lesson involves teaching anything significant, it will likely generate significant controversy. And when that happens, school higher-ups typically scurry for cover leaving teachers swinging gently in the wind. This is why so many teachers water down whatever they teach. They want to render that content as unobjectionable as possible. But in so doing they often end up teaching harmless humbug that results in little lasting learning.
What is to be done? Not very much in a society as diverse as ours. It's just the way things are. Of course smart kids learn anyway. But what they learn is mostly the content from the hidden curriculum. The unofficial lessons kids absorb by experiencing routines, rules, sub-cultures and power structures of schooling. Is that valuable? Sure, as far as it goes. But is that what schools should be for?
Is there any way around this problem? How about avoiding public schools unless you live in an unusually homogeneous school district of highly educated professionals or like-minded conservatives. Another option is to choose the type of private schooling that fits your commitments if it also fits your pocketbook. In such schools there might be sufficient consensus to deal effectively with content that is otherwise prone to castration.
Community consensus or dissensus also strongly influences how acceptable behavior and appropriate penalties are defined and enforced. Years ago I taught in a rural public school system serving a community that pretty much agreed on "spare the rod, spoil the child." Here what was acceptable was clearly defined and the penalty for serious violations was an eye watering encounter with a wooden paddle. Perhaps I should add it was an orderly school district where instruction was possible and safety pretty much assured.
