I don't see a librarian refusing to stock a book as censorship or school saying that a certain book shouldn't be taught. It may be close-minded of those people, but they have a right to be close minded.
For example, I work with some people from time-to-time he feel that they are unjustly censored becaused the government placed them into a correctional facility for view certain media materials. Their reading/viewing material was all child pornography.
I'm okay that the government forcefully censors child pornography. I'm okay with people who view it, distribute it, and make it being horribly punished. Some I wish were punished more severely. I'm fine with my mind being closed to the ideas of child pornography. (To be more open-minded, some of the clients I work with are wonderful people, but would be more wonderful if they were dead.)
In actuality, closing our minds to certain ideas is how people keep their sanity. I would love it if more people were open to understanding more about the plight of the poor in the U.S., AIDS and war in Africa, the treatment of people with mental illnesses, the U.S. health care system, child and domestic abuse, etc.
Honestly, a lot of people I know (friends, co-workers, family) can't handle understanding what it going on. If we were open to understanding everything that happening and all the ideas that are out there, we'd all be wither delusional or disfunctionally depressed. Most people, at their core, would rather be happy than smart or well-informed. So we pick and choose what topics we can handle. I see too many authors out there that try to force their ideas on people, which is just abusive, then scream censorship when people fight back. The censorship counter-attack is just getting old--they should stand up for their ideas some other way.
So I'm okay with peope sticking their heads in the sands. I'm okay with an author not being read. I'm okay with people encouraging others to stick their heads in the sands. People have agency to pull out their heads and the right to face the consequences.
As for people who view things that the government (or a school, community, or religious organization) forceful says they shouldn't view, I feel that organization should be free to use whatever punishments are within their authority. The government can through you in jail; school can suspend, give detention, or expell; communities can ask you to move or stay under the radar; churches can ask you leave the congragation. If you feel the cost of reading the book is worth it, then you're welcome to it.