As I explained in the other thread I am coming from pretty much the opposite environment. Mono cultures fighting for dominance, tanks on the streets, concentration camps, mass destruction of infrastructure ... etc. Therefore I have honest question: why not make all of this with just Germans ? Why the melting pot ?
Short answer: Because we couldn't.
Migration is actually not one topic but at least two or three very different topics:
A - There's refugees applying for asylum. How many of those actually have a right to asylum and how many get rejected drastically varies from year to year. A large share of them actually have no legal right to asylum but are allowed to stay for humanitarian reasons because sending them away would be considered too cruel. Also in many cases some Eastern European country like Bulgaria would be legally responsible for them under Dublin II but won't take them or it takes ages to send them there. People in category A are mostly allowed to stay for humanitarian reasons based both on German and European law. They usually come from poor wartorn countries and often have little formal education or marketable skills. I have personally met an Afghan family where the father of the family couldn't read or write and didn't speak any German while his wife had at least some formal education. Their kid had severe problems at school because he was scholarized without knowing any German and his parents couldn't help him. They need public housing and free German classes and free healthcare and welfare payments until their application is finally processed and they are eventually allowed to work. Then after a few years about half of them finds a job. Some hyperintegrate (there's a Syrian I read about who not only became a citizen but the mayor of the little town he ended up in), some have much needed skills like nurses and since they are predominantly young men with too much time on their hands and a stressful depressing life some do cause problems (more so than the average German but not much more than the average poor male German). They have robust potential to become a net positive but require both a financial and a sociocultural investment. This is the group that much of the political conflict of the last decade has been about.
I recently read about a school in Berlin where 85% of the students were foreigners. Cases like that make things hard for everybody involed. However, my husband is a teacher who has taught many children from lower class migrant backgrounds and if you ask him he will tell you it's not an ethnicity problem but a class problem. Children from poor German families exhibit similar behavioral and academic problems to those of children from poor Arabic families. The lower class' values, views and behaviors are increasingly and somewhat independently from ethnicity decoupling from those of the middle class.
B -There's the much sought after foreign skilled personel. The Brazilian or Philipino nurse, the Indian IT guy, etc. These are desperately needed and we are actively competing with other nations over these people. The birth rate in Germany was at 1,35 children/woman in 2023. It is calculated that we need a net immigration of 400.000 people per year in order to maintain a stable population. Our aging society's demographics is an inverse pyramid. We have too few working adults with even fewer children having to take care of and pay for an enormous amount of seniors. The retiring babyboomer generation leaves behind an enormous gap, many are working past retirement age even though they wouldn't have to because they are so sorely need at their employers' (some teachers teach even past retirement because there are not enough teachers). We need nurses and care worker, doctors, teachers but also bus drivers, delievery drivers, and loads of IT workers and many, many more. There are more unemployed people than job opening because of the qualification gap but still so many job openings that they pose a serious economic problem. The current recession only puts a mild temporary damper on this. We need to be more attractive for category B to survive. They are an obvious net positive.
C - And then there are our legacy migrants. These are people or the decendents of people who came here decades ago mostly as simple migrant workers. Turks are the largest group in this category but there are also many Eastern Europeans including German-Russians that came here in the 90s. Most of the foreigners in Hamburg fall in this category. Their average income and education level is still somewhat below that of ethnic Germans, but they have become an integral part of society. Many of the second or third generation have become doctors, lawyers, engineers, members of parliament, academics as well as athletes, sucessful artists or tv stars ... the two researchers who developed the mRNA Covid vaccine were the children of Turkish migrant workers. They have for the most part well integrated into German society and are also a net positive. They are also very sensitive to both real and perceived discrimination and could contribute even more than they already do if given the chance. They also have a somewhat higher birth rate (it's 1.24 for ethnic Germans and 1,74 for migrants, both underneath the replacement rate but without them we'd be in even sharper decline).
We have had this conversation before. You are not really into diversity as a value in itself and I am not planning to debate that with you. But the demographic numbers are pretty clear and pretty damning. I also know that you think this can be turned around with some welfare programs for families. But this is a global problem/corollary - the wealthier and the more educated people become the fewer children they have. You can't force people to have children and you can't goad them either. Many countries have tried. As I have said before, if you know the secret recipe, sell it to the Chinese government (or the Russians or the Japanese or the Italians or ...) and become rich!
I personally don't care what ethnicity the people around me have as long as they are willing to become a functioning part of German society. My mother is in her late 70s and confident that with enough time group A will just morph into group C. Those who came here as children in 2015 are now young adults and many managed to integrate relatively smoothly.