Catalan identitarianism is very very recent. Culturally they are as Spanish as any other region (spain is relatively federal more so than a single monolithic culture like France). Some of the main reasons for claimed independence are "Spain steals from us". Now this is insulting to many Spaniards as the implication is that they pay taxes so everyone else can be lazy and fuck about. Essentially its based on them wanting a similar tax treaty to the basque country, another rich area who pays much less in tax than other areas with similar average salaries. In other words, rich not wanting to pay their fair share.
Slogans like that have alienated the discussion massively in Spain. Then they elected a local government that made their own campaign about leaving Spain. So kinda like the Brexit party in the UK they had to deliver, so they took crazy drastic measures, government escalated the problem massively and now we are here in no mans land.
Back to your original statement, when do you give legitimacy to a movement?
Catalunya has no historical, political, religious or ethnic divide with Spain. Literally 0. Their tripartit is gonna be mimic now by Cuidadanos, PP and PSOE. Their elites are just as corrupts as madrid. They are as religious as anywhere else in Spain. Catalunya has never been a historical region unless you concede Aragorns crown to be fundamentally Catalan but even then it is ages ago.
Basque country has a much better claim to indepdence in my opinion, and I still do not think they deserve the right of self determination. Not only in part because a great claim of their ethnic difference is still based in anti Spanish racism.
The 9N consultation came out with what, 80% support for independence?
I was responding to the OP's statement:
> We must remember that Catalonia has already held two legal referendums, where the result has been a refusal of the Catalan people to leave Spain or Independence.