Weary,
  You stated that "The UN does not support their case because they have a nationality (Spanish) and nobody is trying to take that away from them."  That's false, cannot find it anywhere, but many articles show the UN being sympathetic to Calonia's desire for independence.  I don't have all day to Google for you.  As for the inconsistency in supporting votes of self-determination, I agree, that's a problem. The law should be more consistently applied. Their is some complexity in the Kurdish nationalism movement however as the region is wrapped in civil conflicts across borders already, and a Kurdish nation would almost certainly overlap several national boundaries. It's more complicated than in Catalonia where their is peace and the division would all occur within current Spanish territory. Nevertheless, no nations request for independence can be ignored on the basis of their political opinions. It's immaterial.