This might sound nit-picky but I think we all (Americans) value education as a whole. We just don't care (as a whole) about education for others outside of our sphere.
When you have the ability to move to better school system or to pay for private school attendance, you have no need to improve public schools. Not all public school systems are bad. I image that everyone can think of one relatively close school that they can unequivocally call a good/great school system where they expect most student to exceed by some set of positive metrics
As long as the people who can fix it (no matter if its more staff, better pay, better resources or whatever change necessary) can place their children into C-Level Preparatory Academy, Dumpster Fire High School probably won't see much improvement.