Those that espouse unrestricted access to knowledge.

This might be a valid idea for academic research, not for K-12 learning. It's not even worth arguing.

In this case, the state wants to decide what sexualities that children are allowed to be exposed to. Is that a can of worms that you really want opened? If the left demanded a ban on books that contain positive depictions of heterosexual romance (for example, A Wrinkle in Time would be banned because of the pornographic, dare I say pedophilic, kiss shared between boy and girl) would you be making the same argument?

So which ideas are you okay with banning? Are you the person who gets to decide? If not, then who does?