You're talking about how it should be, I'm tell you how it is. A teacher's impact is diffuse and spread over 30 students. A parent might only have an free hour

You're talking about how it should be, I'm tell you how it is. A teacher's impact is diffuse and spread over 30 students. A parent might only have an free hour to help their kid with homework. But it's still more individual attention than any great teacher can give. Parents can motivate and enforce standards on their children in ways that teachers just cannot do. No teacher can ground you for failing a quiz, or treat you to Disneyland for winning a science fair prize. Most people would rather make their parents proud than their teachers.