It's not restrictive asking people to adequately integrate into a nation and adhere to it's laws and customs.
Switzerland is a peaceful nation, you make it sound like Saudi Arabia or North Korea, they're not going to chop someone's head or force someone to labour in a salt mine for the rest of their life or something.
I prefer a less restrictive form of "integration" - but as an American, that is what I'm used to. Switzerland is not an immigrant nation - we are, and our culture reflects that. As long as our laws are obeyed, I'm fine with what people choose to do. But Switzerland is also a very small and homogenous nation - our culture isn't even the same from region to region. I'm not saying it's like NK or SA, but to me it would be stifling - no room for crazy dog ladies!
"Switzerland is not an immigrant nation - we are, and our culture reflects that."
This is the fundamental difference between America and the European Continent, America was founded on immigration and you are continuously a nation of immigrants.
The European Continent consists of nations who's culture and heritage have been settled for almost Millenia, why should we want our nations disrupted in such ways as to flood us with alien cultures and peoples, we have nothing in common with each other and this all leads to a dangerous culture clash, we don't want this, we essentially just want to be left alone to continue as we are. This ISN'T a crime wanting this and it doesn't matter how many times the pro-Multiculturists shout and call us names, we're immune from the name calling now, it goes in one ear and out of the other.