As I said in my post the other day, opponents of Catalan independence rarely frame their arguments in terms of the benefits of remaining part of Spain. On the contrary, they're limited to one main argument:
1 Catalan separatism is illegal; and therefore Catalan separatism is undemocratic.
Allow me to present an expanded version: in a constitutional democracy like Spain, the rule of law is paramount. Under the Spanish constitution, Catalonia separating from Spain would be illegal, as would holding a referendum on indepedendence without parliametary approval. Because the Catalan separatist parties insist on pursuing this path without permission and in contravention of the constitution, they are challenging the rule of law. Ergo, they and their supporters are undemocratic.
Read as many PP, PSOE, SCC, Cs, UPyD, central government, foreign office, etc briefings as you like: that is pretty much the only argument ever given against the movement in support of a Catalan referendum. And you can see why: if a thing is illegal and undemocratic, it's bad. It sounds like something from Russia or some ghastly place like that. It doesn't fit with our values.
It's also a nice, short soundbite. If the BBC, FT, Bloomberg, etc ask the Moncloa for a quote on Catalan independence, they only have to say "Mature democracy… rule of law… illegal… undemocratic". I mean, SCC's interminable PDFs pretty much write themselves (you'd almost think it was the same people writing them, but that's by the by). It's an argument which works in today's climate of churnalism, rolling news and short attention spans.
Apart from the fact that I think the Spanish government and their unionist friends should be making the case for staying part of Spain in a positive way, something really irritates me about the 'undemocratic' argument. I think it's because it's based on a combination of a cynically simplistic vision of what democracy is and how it can be practiced, and a highly restrictive and legalistic approach to the constitution which fails to accept the duty in a democracy of ensuring that the law doesn't actively cause political problems to arise. I think this says a lot about Spain in general and about its right wing in particular.
The main problem with this argument is that it reframes Spanish democracy as coercive rather than consensual. When a constitutional democracy acts legally to restrict basic or universal rights against the will of a section of its society, it acts coercively. This coercive nature actually fits with many policies promoted by the current government. From the attempted abortion law reform to the new gagging and anti-protest law to its treatment of Catalonia's right to self determination, you can see a clear pattern. I call this attitude coercive because while the argument is always given (and generally with a nasty smirk) that the constitution provides paths by which the Catalan government could theoretically hold a referendum, in practical terms none of these paths leads anywhere.