I agree that "not voting is also democracy".
However I cannot agree about not allowing to vote, which is the case. It's a political issue, which should be solved like it was in Scotland.
In the name of what, a group can decide over another on what is it allowed to do? Because of the frontiers made after conquering when using force?
"In the name of what, a group can decide over another on what is it allowed to do?"
Of course that a group can decide over another group which is a subset of the former. Otherwise, any city of any country, or any group of individuals, could decide to vote and set their own rules for whatever they want.
Pure rule of the majority is a perversion of democracy (this holds both on the Spanish and the Catalonian level). Taking minorities into account and giving them appropriate rights is just as integral a part of democracy.
"decide over another group which is a subset of the former"
A subset of the former in the name of the frontiers set by a centralist monarch who won a war and forbid language and institutions in Catalonia in 1714. Check the law that supports my comment:
https://en.wikipedia.org/wiki/Nueva_Planta_decrees
"Otherwise, any city of any country, or any group of individuals, could decide to vote and set their own rules for whatever they want." --> And do you think this is wrong? I think self-governance is the future. Not to go against anyone, but to decide more about everything. Not to put a paper in a ballot every 4 years.
In the name of what, a group can decide over another on what is it allowed to do? Because of the frontiers made after conquering when using force?