But censorship in public schools has been ruled constitutional under certain guidelines. Like school newspapers are allowed to be censored. There was a big court case on it, sorry I don't remember the name.
Theres also laws about slander, libel, obscenities which curtail free speech
argument against freespeech: could create a environment where bigotry and racism is tolerated
arguments for: Freedom of speech is in the constitution and therefore applies to all americans
If laws do not apply equally everywhere, then they lose meaning