well at least i think you admitted that the rights exist. Now you only have to realize that force is the antithesis of human rights and you can rewind to the issue at hand the people in Spain have the right to secede. As does California and as did the south.
I still dont think that secession is a “right” like we have a right to freedom of speech and to bear arms. It is merely an opportunity to be taken if people have the courage to try, and the numbers to back it up.
National integrity is something that a sovereign state has a duty to protect. Maybe in this case, Spain may find the juice is not worth the squeeze, but if they offer no challenge, then they admit that Spain is not an entity that has the will to exist, and that it is de facto permission for the disintegration of the Spanish state.