In an important sense, everyone must be a multiculturalist, because each culture is itself a multiculture. Take the social and political culture of the West. It is famously constituted by a dialogue between two intellectual poles—Athens and Jerusalem—a culture of reason and a culture of faith and tradition. But, of course, the culture of the West is not only a social and political culture but an aesthetic one. And here it is composed in part of all sorts of national cultures that are themselves the products of subcultures within the nation.
All cultures thus are mongrel cultures. A culture is also never static but always in motion propelled by collisions with others. And what emerges from the collisions is the result of millions of choices of individuals over generations who determine how to mix and match what many cultures offer them. At its best what underlies all multicultures is the dynamism of liberty.
Unfortunately, much that goes under the name of multiculturalism today is a multiculturalism of coercion.