What should happen when there is a conflict between Europeans "bettering themselves" and economic migrants "bettering themselves"? Would you like to see Europeans roll over and ignore their own economic interests? Or do you believe no such conflict is possible?
Does bettering oneself mean the same thing for economic migrants as it does for Europeans, in your mind? I gather from your comment that it means "attaining greater material wealth" for economic migrants. What does it mean for Europeans? Does it mean sharing their material wealth with the less fortunate, at their expense and the expense of their progeny?
Property and wealth are significant issues, but surely not the only things, and possibly not the most significant things. Safety, security and national and ethnic identity are also important to people. If I live in a country and city where my ethnicity and language are the majority, do I want them to become a minority, and do I want to adapt to culture of newcomers?