They already have democracy, they can vote to send members into parliament to persuade and argue for Catalan independence. If they fail, tough, that's what democracy is, the will of the majority. They can't just say we don't like this democracy, so we'll ignore all of the electorate who disagree and just count those who do agree.
You were after all one of those arguing to accept the Brexit vote on the same democratic grounds, marginal though it was.
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No ,its what your version of democracy is. We both know full well Catalan would not get independence in a Spanish ( note Spanish) wide vote.
What right have you, or any one else, to impose your version of democracy on another Country or group. Its for that group or country to determine what their version is....for themselves. Its called self determination for a reason.
Your reason for opposing is selfish. You want to see a USE, it doesn't fit in with that ,so you have vested interest to oppose self determination for groups within EU. Your view is slanted by your vision, which actually opposes democracy. If Catalan wants its own identity with its own governance like we enjoy nobody has a right to stand in their way. If international, national or local law does then the law is wrong and needs changing.
Quoting constitution or laws is simply pointing out how we don't actually enjoy the freedoms we should.
Why should Scotland have to defer to Westminster to ask for permission for a referendum ? That's not right at all.And Spain being able to call a Catalan referendum illegal and then attack citizens in process of voting is as far removed from freedom as slavery was.
Spain is imposing its view of democracy on the Catalans, that is hardly any better than imposing some other form of government on them. Its democracy in name only.