Here in the U.S. we haer the same mantra, usually from the left, that we have always taken refugees... in fact we pride ourselves on being a nation of refugees. But... in the past, at least here, and I interpret from the news in Europe as well, the refugees in the past represented a mixed bunch... Italians, Irish, Middle Europeans as well as Africans and Asians. Now, the vast majority of immigrants, legal and illegal, are Muslim.
Not supposed to point that out, accirding to the left... but facts are nasty things... thy just kinda hang out there like Grandmother's recently passed gas... everyone knows it but it's not polite to point it out.
It's often been stated by the Muslim leaders that they really have no need of war with the 'west' since, given enough time they simply breed their way into the majority.
That's a difficult concept to actually do anything about, especially in today's era of political correctness.