I tend to agree and I think public schools, at least in the US, have the same basic challenge as most government services. The consumer/parent/voter has direct control over the inputs to the system (funding, policy, etc) as well as expectations on the output (the goals you mentioned), but doesn't actually behave as if they're at least partially responsible for those outputs. I actually think taxpayers are generally supportive of education as a goal, but they think that's achieved by shouting at the school district instead of voting as if education was their priority.

Government bureaucracy absolutely produces less than optimal incentives and priorities, but the responsibility voters have in creating those incentives seems underappreciated, especially when it comes to public schools.