I gave the examples I did to show that the right of free speech is by no means absolute in liberal theory. In the case of copyright violation, it makes no difference whether your utterance is an opinion or something else. A state of mind is precisely what is affected in both libel and copyright violation -- in the former case, a person's repute is affected, in the later, information which is held to be property is conveyed without the owner's permission.
Arguments about the practical difficulties of enforcing a ban on certain kinds of speech are certainly reasonable, but they have not been turned into a theory, other than a theory of utility and convenience. No one has shown why someone who is harmed by racist speech should accept the harm, but those harmed by libel or copyright violation should use politics and the law to defend their interests. I believe this contradiction is implicit in arguing from the First Amendment and other liberal ikons, given that they coexist with the significant restrictions on free expression I have mentioned. If people are aruging that _all_ State restraints on expression should be abolished, they haven't said so.
Gordon