If the Lunarians are so ass mad that humans are walking on their turf and planting flags, imagine how mad they must be if they are in the Gundam universe.
There will be people having life and death danmaku wars out of nowhere, the moon will be used as a base to manufacture mobile suits, humans will soon develop psychic abilities that may very well pose a threat to the moon people, etc.
Now you jnow why they want to be kept a secret.
What a dumbass thread
Imagine how mad they must be if they are in the TTGL universe, where the moon is a Battleship?
Imagine how mad they must be if they are in the Zelda universe, where the moon is slowly about to crash into the planet?
Imagine how mad they must be if they are in the nursery rhyme universe, where a cow jumps over the capital over the time?