“not allowing Arabs, Berbers, Kurds etc. into their countries to begin with.”
You mean like the U.S. has? Oh, and Chinese and Indians and on and on.
I’m against mass immigration from those countries as well for various reasons (not the least being that they’re brought in to undersell American tech worker salaries), but the bulk of our violent crime isn’t due to Chinese and Indians, it’s due to native-born blacks in our urban areas. In contrast, most of the street crime and civil unrest in Europe is due to Arab and African immigrants.