So open discussions of these subjects are not allowed?
In one way, I do agree with you - we should not allow these discussions in public schools. But my reason is that these 'government/public schools' should go the way of the dinosaurs. They have become institutions to support the school unions and to promote brain-washing.
But acknowledging that government/public schools are going to exist, why shouldn't we promote open analysis and discussions of these subjects?
Actually, the way the bill is written it covers all subjects. Teachers who bring in alternative materials for any subject will be protected. Doesn't matter which side they push.