If you see jobs as a limited pool, then immigration increases competition for them. If you see a certain unemployment as a policy choice upheld by the central bank, those with a weak position should consider if it would not be good to get someone weaker then them in the mix. Finland also has unemployment, but lacking proper immigrants (except a few somalis) most of them are palest white. But soc-dems can not say that, it would break the illusion that they will bring jobs after the election.

Otherwise you can view labor as a resource, consider the capitalist economic system as an enemy and want the workers of the world to unite. But that is so 20th century.

All in all, I would say that the soc-dems lack of politics on immigration is due to a general lack of economic vision. I think they should start to fight the BNPs and FNs by actually challenging them, building organization in those strongholds that are situated within worker neighborhoods, but then they would need some vision, some narrative, some ideas (other then "we are less bad then the conservative/christ-dem").

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