Fine I'll bite: draw cartoons of you-know-who, see if they still integrate so seamlessly.
Its the elephant in the room.
But that has been a problem with immigration for years. In Australia in the 50s/60s the same thing was said about Italians and other post-war immigrants.
The first generation works hard and busts their ass to get their kids a good education and into professions and business. They also have more of the attitudes of the society they left (conservative etc).
The second and then third generation adopt their local society's attitude. This leads to inter-generational clashes.
Radical propaganda leads to radicalization to the same endpoint, whether Islamist or Christianist or (in Israel for example) Judaist, or in India, Hinduist.
That radicalization is what is causing the current lack of assimilation. It is dangerous because it is driven by having an in group and an out group. It doesn't matter which religion it is, the radicalization, the precepts (male domination, female subjugation, attacking non-cis genders, non-hetero sexuality etc) are all the same.
That's how it used to be back in the day, but it doesn't seem to be how it works nowadays in countries to which migrant-smugglers explicitly recruit customers based on those countries' unconditional social benefit payments.
> The second and then third generation adopt their local society's attitude.
See the above; and thus...
> This leads to inter-generational clashes.
...thus, inter-cultural clashes, rather than inter-generational.
I really hate the term "culture" by now.
It's not surprising. It's completely obvious.
I do agree that parts of the economy are not working properly. And still we can't seem to get ourselves to vote for different politicians that might do something about it. Yeah that means stuff changes and change and new things are scary, but not fixing those things would be worse.
I said I am not against immigration, but shutting it down for a period or restricting heavily might be worth it due to the potential risks that exist long term.
There's no real harm in trying that for Germany's voters, and by doing so you will also keep the far right wingers at bay.
So that means that the people in Germany that would vote for right-wing parties are the problem, not the immigrants themselves, no matter how well they behave. I agree with that.