I’m not going to pass judgment on the Swiss.
This is reactionary. I lived in Sweden and still have many friends there. Malmo was a city where people never locked their doors and crime was extremely low.
Now, after 20 years of north African and middle eastern immigration, violent crime is way up, there are muslim sections in the city where fire and ambulance personnel will not go without police escort. Violent rape is way up.
Many of these immigrants after 10 or more years in Sweden do not speak Swedish, do not work, and rely solely on the state. Islamist preaching is on the rise there and the Swedes are just plain scared of it.
This may or may not be similar to Switzerland, but I suspect it is.
People get fed up and they have little recourse. I think the vote was an outlet for some serious fear and frustration.