What's the Terrorists' Strategy Here? Answer Below...
While we are at it, we should really also draw a distinction between: (a) the freedom to express oneself, and (b) the demand that others react the way we want them to react, and only as we want them to react, to our expression. The latter is really a demand for a nonsensical, nonexistent freedom from responsibility -- that is, the responsibility to acknowledge that all expression causes reactions, and that those reactions are unpredictable, ungovernable and often undesirable.
Legal arguments commonly hide the real agenda behind some artfully drawn phrase or argument. I sense that's the same thing here. I sense the Charlie Hebdo protests are really not about "freedom of speech," but rather about a "freedom from responsibility."
The "right to free speech" is one thing. But the use of tyranny, whether through violence, boycotts or organized efforts to induce economic or reputational harm to those with whom one disagrees, is part of an illusory (and nonexistent) "right" to compel either the desired reaction to one's free speech, or absolute silence equating to submission. In short, any "right to free expression" as conceived by the United States Constitution does not -- clearly does not -- include a right to exclude, by any means, the speech of others.