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Obviously you didn't understand how Swiss federalism works. We (generally) do not decide for/against other cantons or tell them how they should handle things. Unless it's something that concerns the whole country equally.

See the vote today: There was an initiative about the abolition of flat taxes for rich non-working foreigners. It was broadly rejected around the country. But if a canton still wants to abolish it, they can do that (and some of them do it already).

That it strengthens extreme positions is rubbish. And even if it does, it would have a ridiculously small effect.