I don't have to - some countries have flat out said they have looked at the immigration policies in Europe/America and determined that it has nothing but NEGATIVE consequences & they arent going to try to emulate it
I live in the US and have had zero times where my life was negatively affected by immigration. How about you? When has immigration negatively affected your life? I work with plenty of people who migrated here and they are good people. Russians, Mexicans, Israelis, Japanese, French, British, Canadian, Chinese, Filipino, Jordanian, Iraqi, Iranian, Egyptian, Spanish and on and on. I don't understand why you are so afraid. Is it because you can't compete?