Explain then why the 1st Amendment allows book banning.
You didn't read the link I provided. Teachers today face all sort of obstacles from parents who are too involved in the minutiae and not the education of the child. My other argument would be times change, and so does what we accept and tolerate and what we do not.
"The Constitution does protect the freedom of speech of every citizen, and even of non-citizens — but only from restriction by the Congress (and, by virtue of the 14th Amendment, by state legislatures, too). There are plenty of other places where you could speak but where speech can and is suppressed. For example, freedom of speech can be and often is restricted in a work place, for example: employers can restrict your right to speak in the work place about politics, about religion, about legal issues, even about Desperate Housewives. The same restrictions that apply to the government do not apply to private persons, employers, or establishments. For another example, the government could not prohibit the sale of any newspaper lest it breech the freedom of the press. No newsstand, however, must carry every paper against its owners' wishes."
