This is the parents' responsibility. So parents have a great vested interest. I don't see why the school has to draw lines in the sand. Problems come from the manner in which disagreements are handled. I have learned that there are better ways to obtain positive results than to roar through meetings in a Mack Truck.
Many disagreements turn into power struggles.
Power struggles do not make winners look good. Parents should not be afraid to use their power. True advocacy is about improving the lives of children, and ensuring that they become independent, productive, taxpaying citizens who belong to the community in which they live. Their response surprised me. The school will decide that you make empty threats.