"As I said at the outset, I firmly support the free speech, religious freedom, and property rights of Muslims. My concern is simply that all speakers and religious observers be protected, whether they are Muslim or non-Muslim, or pro-Islam or anti-Islam. Nor does this need to be difficult: The government should tell Muslims (as it tells other groups), “We respect you and your rights, and we will defend you and your rights from violence and government oppression, but if you find certain kinds of speech offensive you should respond with speech of your own; we cannot respond by trying to suppress such speech.”
But the government ought not try to define political and religious speech as “discrimination” or “harassment,” and then suppress it in the name of civil rights. Nor should the government conclude that the speech is stripped of protection because it is supposedly constitutes “hate speech”; the Supreme Court’s precedents solidly reject the view that there is a “hate speech” exception to the First Amendment. Nor should it surrender to the threat of violence, a course of action that only encourages more such threats in the future. Instead, the government should protect the civil rights of all, regardless of their religion or ideology.
Some foreign countries, to be sure, do indeed seem to prohibit speech that is perceived as blasphemy or undue criticism of religion — not just Islam but also, for instance, Christianity: Consider, just over the last two years, foreign incidents involving Jesus Christ Superstar, a parody of the venerated Greek Orthodox monk Elder Paisios, mockery of the Bible, and a painting of Jesus with a Mickey Mouse head. But in America, such speech is of course fully protected against government suppression. That must remain so, whatever religion is targeted.
Read much more here: http://www.volokh.com/2012/11/09/u-s-commission-on-civil-rights-testimony-on-the-first-amendment-and-anti-muslimanti-islam-speech/