Earth is simply the equivalent to an amusement park or zoo exhibit for extraterrestials.
They fly in and get amused when we stare and point at them.
Then they do things to us that are like people moo-ing at cows as they drive be...the people, not the cows!
We are just part of their amusement like the Worlds Largest ball of string or Worlds Largest frying pan.
If you could zip about and visit other worlds would you? Probably. So if they can they do.
And we’re the sideshow.