Cause of course SOME OF THEM are migrants, but most of them have been French for generation, they only have the French nationality, saying "send them back to their country" just means send they back to France cause they were born in France, their parents were born in France and so were their great parents...
Most of them may have been born in France, but they don't feel that France is their home country. I have even seen third generation immigrants supporting Algeria and Tunisia during the football matches against the French team. Similar to the situation in USA, where third generation Hispanics support Mexico in matches against the US.
And that means you get to consider them less than human, tell them where they can or can't live, or deny them the right to follow their own beliefs if they live near you. Yeah, that sounds fully justified.
You genuinely believe you get to play 'thought police' for anyone who goes near your arbitrary borders, despite the fact that if you went back far enough, your lineage almost certainly includes foreign DNA too. No one is a "native" to anywhere but Earth itself.
You've aptly demonstrated why you're a woeful example of the iniquitous depths to which people can sink and still think it's normal. Congratulations.