As I wrote, it's probably a power balance thing - parties in the Swiss system are actually more interested to 'bind' other parties into the government so they c

As I wrote, it's probably a power balance thing - parties in the Swiss system are actually more interested to 'bind' other parties into the government so they can't go out and do populist opposition politics as effectively. Think of it as a stable local optimum that seems to be better (by being more long term oriented) than the typical government/opposition party system.