When I hear speech about "moral obligations," I remind myself of the moderating virtue of prudence (Fortitude, Temperance, Prudence, Justice, Faith, Hope, Charity). In this instance, it would tell us to flee Sodom without looking back.
The fight is over. It has been for a long time. Your are responsible for your own children first and returning to a battlefield with no hope of success is neither virtuous nor morally obligatory.
The Curriculum is just the Flag of the enemy waving over the turf they now own. Even if you do decide to fight, they will keep you on the sidelines. There are no allies on the other side. Remember, to Administrators and Teachers (generally speaking) parents are the enemy.