of citizenship, the assumption of responsibility, standing up for one's own cultural roots and the principle of merit. The result could be a derailed economy and a further decline in productivity, ever higher taxation and a repressive state that increasingly eliminates freedom of expression. Any form of reform or damage limitation is nipped in the bud with the killer argument of xenophobia when criticism is voiced.
As a libertarian/ancap, I don't think that immigration or emigration or whatever should be ilegal, as the freedom of movement is an essential right. But the problem here is not that this immigration use for free the services that the rest of the population is forced to pay at high cost (>60% of the income usually ends up in taxes).
If they weren't being helped and had to pay for everything, immigrants just wouldn't come, and this is where the problem lays.