Opinion. Argues that something had to replace the threat of communism, so `multiculturalism' has been denounced in the media as the new McCarthyism, the new fundamentalism, even the new totalitarianism. Accusations of critics of multiculturalism; What is at stake; Families and neighborhoods reinforced the dogma of monoculturalism; Applaud with one hand the goal of preparing us for a wider world; Advocates' problems; Mistaking verbal purification for genuine social reform.