2019.08.21 Buying Greenland, dissing Denmark
Sometimes you buy something because you want to deny it to your competition, other times it is for leverage to sell to them for something more important, other times it is for underlying value that no one else has recognized.
The rational Journalists (or just human beings) wouldn't take every opportunity to jab the President... what they'd do is ask why. Ask the administration (and President), ask specialists/business people, ask foreign policy wonks. If someone is putting political capital out there, there might be a good reason. What the left did is marry themselves to the idea that it's a dumb idea (because Trump said it) without doing their basic research. Thus if anyone else acquires it in the future, it shows what flaming idiots they are.
We also don't know this was a big diss (disrespect)... for all we know, there was diplomatic discussions and it was part of the agenda for months, and the Danes pulled it off in a poor way and slighted us. So it is idiotic and anti-American to assume that we're always wrong, before doing basic homework.
I could believe Trump was just raging on a half cocked idea. But even if true, I suspect there's a whole lot of interesting context as to why he wanted it, and what the value is. But we'll never know, because the media is more interested in cheap shots than doing their jobs and finding out the what/when/why of the situation.