Not that I have a problem with censorship in a school library the same way we have age certificates on films.
There is a universe of clear blue water between "censorship" and "classification". It was an early example of Orwellian double speak when the British Board of Film Censors (who did not have the power to prevent a film being seen) were rebranded as the "British Board of Film Classification" which did. I think there was a Yes Minister observation about such developments. The War Ministry becoming the MoD rings a bell.
I have no problem with classifications. I have every problem with censorship. Quis custodiet custodes ipsos and all that