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Raver, I never said that we shouldn't enforce borders. Anyone can see that it's bad to have unregulated population growth which outstrips our ability to accommodate it with new infrastructure.
The point I want to get across is twofold: 1) genetic differences within nations are not minor because nations are the arbitrary creations of politicians that didn't follow a genetic map; and 2) if we now accept that nations can have massive internal variability, there's nothing unprecedented about allowing gene flow from the outside.
WRT multiculturalism, I'm not yet sold on the idea that it has failed, but I agree that assimilation is a perfectly sensible solution to the question of integration, regarding which I'd love to see the Germanization of Syrians and the Swedification of people from Timbuktu.
Going further, there's an initiative to craft a German version of Islam, and while I have no intimate knowledge of the project or whether it would strip Islam of its essential characteristics, I agree in principle on the utility and decency for immigrants to energetically imbibe the cultures of their destinations; many do so in fact.