Almost a week ago, Catalonia held a referendum to separate from the Spanish state. Madrid declared this referendum illegal and sent police in to try to stop it by interfering with the voting and seizing ballots. There appears to be overwhelming support for independence. Unlike some other separatist movements (e.g., Scotland), this one is going to stick: maybe not right away but soon.
Regardless of the merits of the Catalan case, the optics here are terrible. Take it from an optical physicist.