What's the psychology behind thinking Denmark doesn't own Greenland?

Erik discovered it. Greenlanders were 100% Norwegian until 400 years later Inuit invaded their territory. For centuries, Greenlanders made expeditions into America, where the USA is today, to trade with natives and explore. Now we are acting like it's immoral for Denmark, which has supported Greenland for centuries, to own Denmark. When Denmark has educated everyone on the island, provided them healthcare free, and stimulates 30% of their GDP every year.

What's the psychology behind thinking Denmark doesn't own Greenland?
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