Spanish government announces plan to seize power in Catalonia, remove elected government

Except you seemed to imply up above that the right to self determination overrides just about all. To whom need I make this “argument”?? To the mayor of my town? To the governor? To president combover boy??

Historically speaking, a “compelling argument” in the case of secession involves weapons.

James Clavell put it nicely in his novel Shogun:

Toranaga: “There are no ‘mitigating circumstances’ when it comes to rebellion against a sovereign lord!”
Blackthorne: “Unless you win.”
Toranaga looked at him intently. Then laughed uproariously. “Yes, Mister Foreigner…you have named the one mitigating factor.”