Scaling over 1,000,000 people to a low percentage is a detached perspective, but when you consider even 1% a year is unsustainable you can see why people are getting tense. Especially when the people there don't see it as 1%, they see thousands of people coming to their town, then when a couple of bad eggs resort to crime, their view on these "strangers" becomes bad. Mass migration of any kind, us going there, them coming here is a disaster waiting to happen. The culture clash causes all kinds of havoc, breeds hate, and then you segregate. In this case we've had hundreds of sexual assaults and it's divided people in Germany. Point being, this fix is just a treatment of a symptom, not the cause. More effort to give these people their homeland back would be better.