Surely you understood what I was saying but so we don't talk past one another: Yes there is a category of people called an immigrant that one can define. However when you look at groups or even individuals in that category there are certain differences, many times vast and very meaningful differences, between the things in each of those categories. So to treat the whole group the same would be foolhardy; thus the need for a selection process. If you had to purchase 10 sheep from a group of 100 would you not buy the best sheep you could afford or the best pizza you could afford?