Conservatism without Nationalism is like Faith without Works.
I use the analogy of a nation being a house. And there are houses in a neighborhood.
Neighbors get along fine because each has his own house where they make the rules.
Multiculturalism is essentially moving several families into the same house. Whereas as neighbors they got along fine, now they argue and fight constantly about everything. It doesn’t make them bad people, it just puts people into an unfair situation.