Because it is incredibly ineffective to do each one seperately when they are all interdependent.
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They aren't, they just aren't trying very hard to take the fall for the UK's decision in their (the UK's) place.
They didn't threaten the UK, they made predicitons.
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When you objectively make no sense then nobody has to understand how you came to your claims to reject them, you are the one who has to demonstrate how you arrived at your conclusions from sources you can name.
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Indeed, and that is why the EU is funding projects to preserve such culture and languages.