[...]You're going to have to explain your use of stale in regards to Nazi Germany. I may or not agree with you depending on the meaning.
Well, what happened in Germany was not an isolated even by any stretch of the imagination, I'll say that to begin with. Europe hasn't always been a welcoming place until a couple of decades ago. I mean, look, what happened in Germany happened in Spain from the 1500 to the 1700 and in France a century or so later. What am I saying with all of this? To make things plain and simple, Europe has always been ruled by 2-3 things: The church, feudal system and as of lately people with money. Now, 100 years ago all they had was the church and the feudal systems sucking the blood out of the Europeans. The Church was doing "God's good work" by instilling an irrational hate for foreigners/non-Christians, especially jews (in fact, even nowadays, in some places, in Europe being called a "jew" is an insult). Fast forward to the 1920s and 30s: Marxism, fascism, etc. All movements that posed a challenge to the bipolar system of power: the church and the feudal system. What was the response to all of this? Well, a turn back to the way Europe "used to be". Romanticism 101. Due to all these movements European societies began to close the doors on anything that wasn't "country" and went back to self-adoring their origins. Now, we all know that what they were really hating is the semislavery conditions they had to endure on a daily basis, so eventually all that hate brewed through the decades (which resulted in two world wars and countless others) had to go somewhere and the victim was... well, the preferred victim in Europe: the Jews. In reality, it was more than the Jews, there were Gysies, communists, anarchysts, etc. Spain, for christsake! 40 years totally isollated because of the Generalísimo Franco. What did he do as soon as he overthrew the democratically elected republican president? Restore the church in positions of power (they had been totally isolated by the republicans) and restore the monarchy (the feudal system).
Where am I gettin with all of this? Well, it's not really the immigrants that are the problem (unless you're talking about the radical muslim types, which are human garbage and shouldn't be allowed anywhere but their own countries) it's our fear-mongering. Upper classes use the immigrants as a "you see what will happen to you if you do not participate?" type of response to an active political population. And this is where nazi Germany comes in, because they were the last of the Mohicans in trying to make create a Valhalla for "their people" (although, let's not forget, one Hitler's goals was to "cleanse" Europe) in which an irrational hate or dislike for whatever that was not "like them" was instilled in the very young. Now, see what happened to Germany between the time of the German Empire to the reunification period and you tell me whether German society is better off now or not.
I hope I got the point accross (although a historian would've killed me for turning 300 year-long events in 1-liners though).