The thing with spain is, it was unified mostly due to the Catholic Kings knowing the only way to survive foreign powers was unification. It is less of a country and more of a feudal defensive pact. Every region has its tradition, every region has its culture, every region has its language, and our regions have spent their entire existence fighting each other.
Cadiz for example was founded by the phoenicians, and has strong roots in traiding and naval construction, it's always been the least religious area of spain and indeed Carnaval, our most priced tradition, is devoted to Momo, GREEK god of sarcasm, but not even the inquisition could stop it. Cadiz was the most progresive area in republican times, and is the most open always.
Seville, our close neighbors and community capital, is the most RELIGIOUS bent. They were the capital of castille in the early days, before which thet were the capital of al andalus, they had the america's port, and as such they always had the missionaries running around, they're strong catholics and yet, in fact the church they have the most in common with is the orthodox, as their missionaries were lowly men and they shared a lot of culture with the colonies and they are the strongest penitents. So while they claim to be catholics they have little to do with the vaticans, and many would consider them heretical.
Yet Burgos is the real catholic capital of spain, that's where the chief bishop is. It is also where the most strong monarchic tradition exists, they're basically feudalists even today, and are so heretical their bishops have a tendency to critizice the vatican for being too soft, and at multiple points consider becoming a second pope.
Then we have catalonia, the area that had the most jews, and the strongest french roots (indeed their language is just the bastard son of spanish and french), they're a slimy, commerce minded, anarcho capitalistic region with heavy industrial focus and no regard for workers rights since most of their workers are andalusian.
Meanwhile their neighbors in basque country are hiperreligious, hypernationalistic mostly rural scottish-like brutes with no mind to progress and their own tradition, they were the last bastion of european paganism and they damned remember it.
And then we have the two castilles, castille-leon and castille-la mancha, they're actually very similar, being semi-rural and suburban areas, with a guild-focused past and strong architecture and metalurgy, and that's why their entire existance is basically a giant dick measuring contest as to which is the best castille. I'm not even kidding here.
Meanwhile Galicia is just a forested area with plenty of fishing and horrid weather and mountains most similar to norway in general culture. Mostly wanting to be left alone in their little corner.
And Murcia is where the most openly fascistic culture lives, being in the odd spot of being the only mediterranean coastal area of spain with little commerce, they're fully rural, set in their ways, extreme right wing and indeed most similar to hungary.
Granada, their direct neighbors, is where the moors stuck the most. And while the inquisition took care of the muslims, it left them the weird mannerisms, fruit based agricultural mindset, weird architecture, and tendency towards moorish culture, specially in the arts.
Do you see where this is going?! Spain ain't a country. It's the geographical equivalent of frankenstein's monster! It shouldn't exist! ... so why does it? Well it's simple really. Just look at the catalonian's plight. Recently they tried to break away. What happened? Spain told them if they did they would have a border like everyone else (meaning customs) and Merkel basically told them they would be her slaves. Which spain is but thanks to poorer regions they don't fuck us as much as they'd fuck them individually. So they had to reconsider.
Every time spain's thought of breaking, it's found france and germany fucking SALIVATING at the thought. If spain doesn't stick together, it dies, it's that simple. And that's the duct tape that's founded our brotherhood, survival.
Now. Combine this with our strong bend towards individual action and against centralization, and you can see how spaniards simply cannot and will not agree. Fuck, most of our regions were founded by knights that disagreed with their nobles and decided to take action on their own, most famously the Cid, and indeed the Cid best defines spanish spirit, he rebelled against his own king, but never against his country. And so despite our lack of agreement, that's not to say we won't help each other.
I think our actions in this crisis proves we'll happily give our lives for each other, our medics are doing just that right now. Tell cadiz catalonia is getting invaded and we'll be there knife in hand with no plan of action ready to help.
But centralization though? Nah. You don't give spaniards an organized standardized plan, you tell them what's going on and they'll figure what to do. I think the letters by hitler about the blue shirst best define this. Read the "legacy" segment on this wikipedia article:
https://en.m.wikipedia.org/wiki/Blue_Division
And you can see similar sentiment expressed by the russians about our partisans and forces in exile, and even by the brits, just not as clearly put in official manner. Because that's just how spain is. Spaniards can't really follow orders blindly to save their lifes, not in the long term, bark orders and they'll follow you until they start making questions, but once they do, they'll find alternatives. And so long as you learn to accept that, not a single inch of ground will be given. Not a single loss will be accepted. But don't tell us to do it "your way", that just doesn't work.