This kind of crosses over to the War on ISIS thread.
Any attempt by a European people to preserve their culture is Nazism and should be derided as such.
The problem right now is that those who are concerned about the massive invasion by Muslim migrants have no voice other than right wing parties. The left wing, socialist parties are all for immigration and multiculturalism, despite the fact that it hasn't really worked when it comes to Muslims. But many of their supporters work for social services, so they might think they'll have a save job, bigger budget and so on.
The social democrats and conservatives (except the Bavarian CSU) are also supporting the massive inflow of low skilled workers who can barely read or write their own language, let alone any other.
Germany, it's government and the industry leaders that is, have tried for years to attract young, highly qualified foreigners but without much success. Why? Well, those exact people they were looking for can make more money elsewhere.
And that's the main reason why German companies and especially the car manufacturers could pile up massive profits:
For decades now the wages of workers were kept low, they didn't go up as much as the inflation rate, so every year people had less to spend while prices, rents and taxes/ health insurances went up (in particular after the EURO was introduced).
If you can hardly make ends meet you don't buy/ build property and for sure you do not start a family.
And that is why there is a lack of young people, the majority of (working) parents simply cannot afford having kids. Plus, they might have a job today, but maybe not tomorrow or when they get to a certain age. There was a time when workers who got to the age of 55 were laid off and where handed over to the government to pay for their early retirement.
A total win-win for the companies, because some of these people would come back and do the same work for less money.
Many companies do not train their own staff, they rely heavily on staff that has been trained in smaller companies but then move on because they want to earn more money.
The only way smaller companies can survive is to have highly qualified workers, so the job requirements have gone up.
A Hauptschulabschluss (I think it's equivalent to a Highschool degree) doesn't get you a good job or a place as an apprentice any more. That's why so many young people, especially those with a migration background (again, mainly Muslims) are unemployed.
So, with already existing facts at hand I don't think that many of the migrants will find work that gets them more than what the welfare system would pay them, so why bother?
German politicians say they don't want parallel societies, but fact is they already exist for quite some time.
There will be 3 elections this month and the big parties' leaders are shitting their pants, because the AfD will gain many seats, in some states they will be stronger than the social democrats and will come dangerously close to the conservatives.
That's another reason why they are constantly called Nazis and racists (again, some of them most likely are, but compared to France it's a small number) in the media, the big parties are afraid to loose influence and power, and also the big money coming from German corporations.