Using the constitution as some sort of shield / holy bible that can't ever possibly be changed IS what show the weakness of Spanish democracy.
In the end, governments are there to serve their people. They don't make sense as entities on their own. They represent a group of people who chooses to be represented by their government. If the government attacks the people and refuses to hear to what people have to say, you need to resort to not following the dogma.
Politics is the art of the possible. Right now, this is not possible and pushing for it is not constructive.
When defining a right, you must show who is the subject of that right.
Anyway, when that site states "All peoples have the right to self-determination" Is there a minimum number of people to aim for 'this right'? V.g. if 259 persons in Els Hostalets de Balenya say the want 'the right to self-determination', are they a nation from then?
As to when you stop with the right of self-determination, in the case of Catalonia, from a cultural, language, and historical point of view, there's enough reasons for a referendum to be held (given the discontent of the population). There's a similar situation with Quebec, for example. As far as I know, there's nothing about New York --language, history, or culture-- that would warrant a referendum, and there's certainly no reason for you as an individual to do so (you don't even have the basic political institutions).
The so-called "right to self-determination" doesn't exist in the Spanish Constitution, nor in the International Law, nor in Comparative Law.
https://elpais.com/elpais/2014/10/10/opinion/1412946101_9911...
If a sufficient number of people in a geopolitical area wish to govern themselves, broadly, it should be seriously considered by any ethical government.
The circumstances matter. I can't draft a workflow for "ethical independence" on a Friday morning on HN. I can say there is a difference between self-determination and the desire for liberty vs. mass murder, conquering territory and waging guerrilla warfare against multiple nations.
Freedom is Slavery,
Ignorance is Strength,
Trying to organize a Referendum is Antidemocratic.
What people can't do is play outside the Law in a Democracy.
Changing how when the two main parties are against this change?
That argument is just an excuse.
Articles of the Estatut d'Autonomia where denunced by present the ruling part declared invalid by the TC but that same party wrote carbon copies of them in other Estatutes it say how the situation can change.
If you state "that same party wrote carbon copies of them in other Estatutes" you have to give us sources.