Denmark is a founding member of NATO, deployed troops to Afghanistan when the US was attacked on 9/11 and lost 40+ soldiers. Denmark has spilled blood for the US.
It's an ally as much as it could be, the US's presence in Greenland is entirely because it is in US's interests, and for that, as an ally, Denmark has always allowed the US to deploy as many troops as it wanted. Also as an ally it allowed Americans to do business in Greenland.
What else do you want? You aren't even American for the Trump administration, do not understand how you got so entangled in this bizarre worldview.