Yeah but the part about jobs is true as it stands. Not in the current paradigm at least. But that can be fixed when people and politicians will accept the fact it is broken. But I don't think it should have any bearing on the refugee question. Economic discussion in those moral questions are valid but often cheapens the argumentation, like with death penalty discussions. I absolutely agree that immigration can help offset demographic decline and that's probably something worthwhile to pursue.
War refugees should be fostered to the best of our capabilities because they're, well, refugees and we consider that distinct from other forms of immigration "by choice" (this is of course all debatable, but there's laws and texts that regulates all that, so there's a real reasoning there). I think countries are entitled to apply a form of immigration control but the current belief in some European quarters that you would be able to stop the immigration flux (or to downsize them to minuscule amounts) is a fantasy, and a morally twisted, costly one. I also think the integration difficulties are vastly overstated (even if there's very real problems with that as it stands). France managed to convince 150 years ago former slaves and slaves descendants living off the coast of Africa, in the Caribbean, in South East Asia or in South America that they were French so it's certainly possible. I mean those people come here because they believe our countries provide better life at some level, so they're already awe-struck and open to cultural conditioning, if I can put it that way.