Well, that is obviously why they allowed it because they had all the polls indicating that there was not risk, but now, in Spain after 30 years of the fascist secessionist indoctrinating people since childhood, because they already has a huge amount of self-goverment and controlled education among many other things, they know that they have enough indoctrinated people to push ahead their secession madness.
It is not allowed under European Law, not allowed under the Spanish Constitution and not allowed by the rest of the Spaniards that will not accept that some left fascist secessionist steal part of the Spanish land.
55%-45% (in the case of Scotland) is not a sure thing.
come on, don't be naive, they know beforehand everything, every poll and election is a farce.