Too many students leave from home unfit to learn Schools reflect society. If society has morality and respect for authority, the schools follow. When these characteristics vanish from society, they also vanish from the public schools. There is a confrontational atmosphere in public schools.
Many kids lack all social skills.
Everything tends to become a confrontation, student to student and student to teacher. The slightest bump, look or comment can easily escalate to something greater at any time. It becomes difficult to teach or learn under such adversarial conditions. Someone in the home controls these factors. Younger students especially depend on parents for everything.