Not by design. That occurs because those who teach or administer in schools are not true to its purpose or intent. It was perverted.
Axiom:
All schools must restrict free speech, press, assembly, and establishment and expression of religion. If they didn’t chaos would run wild.
Axiom:
It is impossible for any school to be religiously, culturally, and politically neutral. Such a philosophic state of neutrality is impossible in the mind of any sentient human.
It is for this reason government schooling is unconstitutional.