Multiculturalism destroys everyone.

The desire to mingle with other cultures stems from a lack of self-knowledge and sense of identity. The secularization of the West made Europeans apathetic on discerning foreign cultures.

When you stand for nothing, you don't mind the rape of the society your ancestors built for millennia.

Then they said, “Come, let us build ourselves a city, with a tower that reaches to the heavens, so that we may make a name for ourselves; otherwise we will be scattered over the face of the whole earth.”  Genesis 11:4

We're not meant to just accept other religions and cultures as our own. Some religions fundamentally command to destroy your people, like Islam does.