What are you talking about? Only valuable for capitalists? If anything its MORE valuable for socialists. Immigration is a net positive unless your a xenophobe. It brings in new people many of whom are already educated so you get all the benefits without having to pay to educate them, and even the ones who arent as educated still are really hard working people who contribute a lot to society. People who arent go getters dont travel thousands of miles for a better life. The only real challenges presented by a lot of immigration are logistical in nature and socialist economies are better equiped to meet those challenges than capitalist ones. Plus even outside the economic benefits they bring with them diverse cultures and foods which make life more interesting and fun for the people already living there. One of my favorite things about America is all the different cultures and foods you can find there. Immigration only becomes a problem when you treat it like one and start treating the hard working people looking for a better life like criminals and then force them to turn to criminal acts to make ends meet. If you welcome people with open arms and provide them with opportunity then its only ever going to be beneficial to everyone involved.