because immigrant groups behave differently. if you only have 80 iq illiterate syrians who are too dumb to even work then it's easy to keep them strictly segregated and disenfranchised. it's much more dangerous to import intelligent and industrious immigrants like the anglosphere is doing because those people will eventually replace your elites and control the country, which is what you see happening in the us, uk, and australia, first it was jewish immigrants, and now it's indian and chinese.
United States