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Genuine question: why would Denmark be happy/help Greenland become independent?
Because Denmark is a democracy and the people on Greenland has voted towards independence. Denmark is not keeping them from seceding, but their economy has kept them from doing it before.
An independence referendum has not been done yet, but once they do it, Denmark will most likely accept the outcome without objections. Iceland did the same thing in 1918.
https://en.wikipedia.org/wiki/Greenlandic_independence