If it were literally a 3-year temporary visa or something, I'd agree (and they wouldn't be there anymore, because overstaying would lead to deportation). But th

If it were literally a 3-year temporary visa or something, I'd agree (and they wouldn't be there anymore, because overstaying would lead to deportation). But they didn't illegally overstay. They simply worked in Germany long enough to became German nationals. Partly, because in the EU (formerly European Community), the concept of a long-term "guest" with no rights is just not recognized: if someone lives in your country for years at your invitation, is able to support themselves and not engaged in criminality, and has learned some language/civics basics, they have a right to apply for permanent residency after some period. I don't think I support the concept of a long-term "guest" with no rights, so I don't think it's wrong that such rights exist. That's what countries like Kuwait or Dubai do, with long-term "guest workers" who don't have legal rights. If someone has lived and worked here (Denmark) for 5 or 8 or 10 years or whatever, I think they should have legal rights on that basis. Much more so if they were born in Denmark; and doubly that if their parents were born in Denmark too, so that it's been two generations since they were immigrants. What is the alternative in that case, deport someone who was born and raised in Denmark to a country only their grandparents were actually from, and whose language they don't even speak?