Even stepping back from this teaching aspect and into the abstract, making essentially mid-level staff employees responsible for factors that are well out of their control and above their pay grade is the sign of an unhealthy business. As a developer, is it my responsibility when product drops the ball or the business mis-invests its money and goes under? Teachers play a very important role in a child's development, and there are rockstar teachers that will truly turn a child's life around and put it on a different trajectory than where it would have been otherwise. But it's not in their job description to be able to do that for every child, regardless of how seriously they take THEIR job of being a student, or a parent's job of raising a child that is prepared for the real world.