I wasn't saying it's a walk in the park, I was just pointing out that Germany and EU on the whole won't crumble under the pressure, not even close.
As for the answer to the last question, you can pick one of two:
1) Not all migrants before were EU citizens, especially as many were coming before the legal concept of EU citizen existed.
2) Right wingers were using the same arguments for eastern European immigrants (not enough room, not enough jobs, uncivilized, prone to committing violent crimes, uneducated...)
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