There is very little reason to be scared of refugees coming here under a false identity. If somebody wants to enter Schengen to commit a terrorist act, they'll

There is very little reason to be scared of refugees coming here under a false identity. If somebody wants to enter Schengen to commit a terrorist act, they'll find ways that are easier and safer than under the guise of an asylum seeker. Of course, there is little reason to be scared of terrorism by anybody, anyway. The violence that occurs in the context of the refugee situation is, so far, almost exclusively caused by xenophobes -- the fact that this is not denounced as terrorism just shows what a useless label it is, as if we needed proof. The only reason why Germany wouldn't let people enter is because the Dublin II rules say otherwise, but rational people have known (and been saying) for years that the Dublin rules won't hold up -- rules that make any refugee situation mostly a problem of the relatively less-well-off (though, globally seen, still very rich) south-eastern EU periphery. Those countries have clearly proven to be unable to cope -- being overwhelmed, incompetence and maliciousness were all part of that --, and it would have been inhumanitarian and, frankly, impractical, to proceed with Dublin II. None of this has anything to do with data retention, of course. Though I suppose it is more consistent to combine a draconian data retention policy with a draconian refugee policy, as, to pick one example, the UK does.