This has nothing to do with minarets and call to prayer in particular, but the totally racist rightwing extremist majority party being "clever" in setting it as a symbol for their hate (you should hear the shit the "leader" that initiated this says, nothing short of nazi propoganda moves), I seen reports on this all week, and its nothing but pure xenophobia, Swiss doesnt have ghetto suburbs filled with predominately immigrants/muslims like other western countries (but more like immigrants/muslims live amongst swiss in general), so they couldnt use an area as a symbol of their hate, easy to poiunt, and had to be more selective and "clever" about it, in choosing something that is noticeable. And whats noticeable in every day life for Swiss? The simple mosques that are visible due to their minarets, minarets that are no different from church towers.
Corious, basically been a GENERAL policy by rightwing bigoted parties across europe (the fuckers have an continent wide association where they meet) to ease off the usual hate all foreigners schtick to now exclusively feeding on the islamophobia and targetting that as fearmongering goldmine (they did this in Sweden recently).
Its lovely for the oh so "nice" swiss to show their colours. Now they are nothing diffferent from the dannish, austrians and so on. In fact, worse because this law is takes it quite further. I mean, how ironic isnt it that this law is registered just below the law that says everyone has the right to express their religious beliefs.