Think about the qualities of a qreat woman. Is it that she’s a tricycle — easy to ride? That anyone can come over and have sex with her? No. It’s the opposite. A good woman is someone you can be sure who the father of her children is.
Same goes for countries. Do open borders make for quality countries? No. Jews are a prestigious community because they make conversion difficult. All great places and people have strong borders. Israel and the United States have tons of trash because they have allowed in the wrong types of people. If you allow in lots of Africans, you import the qualities of Africa. If you allow in Mexicans, you import the qualities of Mexico.