Should the USA invade Greenland?

Okay, the topic title is clickbait.  Like, I make it sound like I think that this is a 
serious question, open for debate on the pros and cons.

I don't.

Stephen Colbert put it in perspective.  This is an approximation of what he said:

The NATO charter clearly says that any attack on a NATO member shall be treated, 
by all members, as an attack against all.

So that means that, if we attack Greenland, we'll be obligated to go to war against
 ... ourselves!

Gee, that's scary.  You really don't want to go to war with the United States.
They're insane!