I have always wondered why the Spanish right wing is so determined to keep Catalonia. It is a gangrenous appendage that only gets in the way and causes putrefaction in the body. What I have always supported is an agreed independence, with UN supervisors. Of course, with the corresponding debt and with vetoes to both NATO and the EU.
It is a fact that, without Catalonia, the right wing would ensure its perpetual victory. The Psoe as a party has disappeared from the rest of Spain, the same with Podemos. To want to keep Catalonia in these conditions is foolishness and masochistic fetishism. Of course the Psoe knows this perfectly well and that is why I believe they would never agree to a referendum.
If the PP became the party that let Catalonia go their usurpation by Vox would be all but guaranteed. Not to mention that it would likely cause a domino effect leading to the Basque country declaring independence, and who knows which other regions in the decades to come. Spain is an incredibly fractured country and the relative success of many of its regionalist parties demonstrates how fragile it is.