Your premise is refuted in the classic SF short story, The Man Who Sold the Earth, by Otto Binder. ( I can find mention of it on the web, but no source. ) In the story, a guy in a bar in NYC sells the earth to some stranger for a few hundred dollars ( I think ) then worries about the possible consequences.
Anyway it couldn't be a lot worse if the Islamo-Nazi wing thought they did own the moon. (But whatever they THINK, they don't.) They're trying to enforce the title they may think they have. This is no time to shy away from "reality therapy."