History is full of ironies, but this is one of the most unreal.
In an effort to not be like the Nazis and avoid that whole accusation of genocide and ethnic cleansing thing (which can be accomplished by deportation, too) they have allowed themselves to be overrun by people whose philosophical predecessors were closely allied with the Nazis, with the result that the German people are going to have a hard time not being ethnically cleansed themselves.
Whether through some sort of national guilt, stupidity, or other and more nefarious influence on policy, the result will be the same. The alternative is to stop this now before it gets more deeply entrenched. The task will become no more pleasant and no easier with time. They want Sharia courts and Sharia police, that is a clear sign they have no intention of assimilating.