We who have the luxury of living in the West have an obligation to stand up for liberal principles. Multiculturalism should not mean that we tolerate another culture's intolerance. If we do in fact support diversity, women's rights, and gay rights, then we cannot in good conscience give Islam a free pass on the grounds of multicultural sensitivity. And we need to say unambiguously to Muslims living in the West: if you want to live in our societies, to share in their material benefits, then you need to accept that our freedoms are not optional. They are the foundations of our way of life; of our civilization - a civilization that learned, slowly and painfully, not to burn heretics, but to honor them.