Why do neoconservatives criticize multiculturalism and political correctness?

Neoconservatives argue that multiculturalism—the principle of respecting and encouraging the coexistence of diverse cultures—tends to undermine the traditional culture of any nation that adopts it. They believe that this focus on cultural diversity, combined with an overly acute sensitivity to avoiding offense toward different backgrounds and outlooks, fosters the excesses of "political correctness".1

From the neoconservative perspective, these trends are problematic because they threaten the cohesion of Western civilization. They contend that such policies are likely to trigger a conservative backlash, citing as evidence the rise of anti-immigrant political parties in countries like Denmark and the Netherlands during the 1990s and early 2000s. Ultimately, neoconservatives view these developments as part of a broader cultural crisis that challenges the established institutions, customs, and traditional values that they believe are essential for a stable and moral society.12