Money and power..... And propaganda.

The elites don't want immigrants, they want wage slaves. Who will come when they are told to, live like they are told to, work in any condition they are given and leave when they are told to.

So the goal is to deport these pesky immigrants with rights and import those slaves, then those slaves will work for extremely cheap cuz the threat of deportation and how their home countries are beyond fucked anyways.

Who benefits from slavery? Is it the working class (poor and middle) or the elites who will have cheap labor?

Not to mention this will reduce the salaries for everyday Germans, and then elites gets to claim 2 things to fellow germans:

1. look at all the immigrants who are stealing your job and driving your wages down.
2. look at how much our economy is growing (it will be the elites who will be getting all the wealth not the working/poor class)

Btw you can replace the whole scenario in USA as well with the whole H1B visa stuff.