This is a myth based on skewed data, by the way. This "net contributor" figure was reached by combining the wealthy Luxembourgian bankers who sometimes immigrat

This is a myth based on skewed data, by the way. This "net contributor" figure was reached by combining the wealthy Luxembourgian bankers who sometimes immigrate to countries with the thousands of people they offset. If there were no welfare, the Luxembourgian banker would still be able to immigrate. As would lower and middle class people who work. The only people you're defending at that point is the people who refuse to work (a significant portion of the migrants during the EU migrant crisis still do not work). A "safety net" is not supposed to be used so you never have to work. It's supposed to be a temporary cushion if you are in a bad spot. Not 2, 3, 4, 5 years (which you spend not integrating into your host country at all). Integration is a major problem, and migrants have created enclaves in Sweden, Germany and the UK with rules that do not match the host country.