This vote was only about restricting immigration from the EU, though, not immigration from outside the EU. The two biggest immigrant groups in Switzerland that will be hit by this measure are Italian nationals, and German nationals (the two biggest sources of Swiss immigrants). There is apparently some tension between Italian-speaking Swiss and Italian immigrants; and between German-speaking Swiss and German immigrants, despite those groups not being from wildly different ethnic or cultural backgrounds. It's not like there is some Italian ghetto inside Italian-speaking Switzerland that is failing to integrate into the majority culture...