They don't give a damn if you have 13 children, they don't want brown people in Switzerland.
Swiss nationality is not linked to your birth country, it is linked to lineage. There are second, third, (fourth, fifth, sixth?) generation immigrants in Switzerland that are not Swiss. Conversly, there are Swiss nationals that have never set foot in Switzerland.
That's the part they currently don't say out loud. They are getting bolder and bolder though.