Flat out wrong. The influx of immigrants has heavily benefited most European countries, on both ends of the income spectrum. My GP doctor is Arab. His assistants are Austrian. Without him immigrating, they would not have a job, and I would not have the doctor I trust going to. My landlord is Jewish, and he employs several Austrian people. The owner of the plumbing business that fixed my toilet the other week is Turkish, the plumber who came in himself was Serbian, the apprentice Austrian.
Fact of the matter is that a lot of immigrants are taking jobs, yes, but those are mostly jobs that the majority of inherent citizens wouldn't do (working in construction, cleaning, healthcare, etc.), or couldn't do (academic jobs). They also employ other people, both immigrants and native people.
Pair that with the fact that the native society of most Western countries is aging, we NEED immigration in order to fill the workforce and pay our elders welfare.
And there's several generations of people born in Europe that still want a fascist dictatorial state. So?
I was born in Austria, and yet I do not identify as Austrian. My mother was a Russian Jew, which I consider myself, and I would identify myself as European before I identify as Austrian. Heck, I would prefer identifying as Sammarinese before I identify as Austrian although I only lived for a few months in San Marino as opposed to Austria for most of the rest of my life.
I do not have to celebrate or live the culture of a country in order to be a functional part of its society. It is none of your business what I refer to as myself culturally, how I celebrate my holidays, or if I eat pork or not.
There's a German city, I forgot its name. They have a lot of immigrants, but those immigrants are Japanese. They have Japanese schools, Japanese kindergartens, Japanese businesses, Japanese stores with Japanese products and Japanese price labels, where everyone talks Japanese. And there's no problems there whatsoever. You know why? Because everyone is tolerant of each other.
Saying that your co-worker identifying themselves as Turkish is a problem is, in fact, the real problem. So what if they identify as Turkish? Isn't that up to them?
Anectodal evidence. Last time I was harassed by children, they were blonde, pale, had blue eyes and spoke perfect Viennese dialect.