This news concerns the biggest shift in Trans-atlantic relations in decades – possibly ever. The US is not losing relationships with single countries such as France. It’s not just scaring a small population like Denmark. The entire ”Western world” has started decoupling from the US. Tech is one of the first targets.
Denmark is a part of NATO, attacking them would mean the entirety of NATO would go against USA, not just Denmark. It is reasonable to assume the entirety of NATO would put up enough resistance that USA had to withdraw from that war without getting Greenland, because Trump would get removed from office by being so hated by the people before the rest of NATO gave up.