Because we can abandon our source of income, friends, family, and house in order to try to build up a new life from scratch on our own in a country with a very different language, writing system, culture, and laws we have no reason to complain? What is your reasoning behind that? It seems to me that we would have the right to stay were we build up our lives and have our friends and family and still get treated properly. If I come to your house every night and wake you up by making a lot of noise, do you have no right to complain because you can just go live in another house?