It's not censorship from the government. Parents need and should have a say about what it's taught to their children in public schools. Government censorship would be the government preventing anyone from buying or borrowing through any legal mean, and penalizing those who read it.
You're describing some thing being outlawed. A government may censor information that is otherwise available via legal alternative avenues of delivery.
I strongly disagree. If parents think they know better how to educate children than professional teachers, they're free to homeschool. Most voters are not educators, and what materials are appropriate for educational purposes isn't a matter that should be put to a vote of the general population.
If I’m not mistaken, your implication is that material should be taught to kids regardless of parental input.
It’s in everyone’s best interest to keep the state out of matters such as these. This is precisely what history has taught us. It’s not this exact matter, it’s what such a move would do for future iterations. Lines should not be blurred in matters such as these.
A simple example is a school teaching creationism vs evolution. You can take your argument and swap the material. What if the local government enforced creationism, and barred evolutionary material?
I'm not keen on any kind of government interfering with school curricula. What is tsaught, and how it is taught, are matters that should be decided by professional educators. The job of a politician is primarily to influence the public's views, and they won't do the right thing if they get their hands on the levers controlling education.